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Cornet ED78S EMF Meter – My Review

Posted by Lloyd Burrell on April 20, 2013 under Cornet meter, EMF meters | 238 Comments to Read

This new EMF meter is called the Cornet ED78S.

Does this meter revolutionize the world of EMF meters?

I wouldn’t go that far but the ED78S is a great little package.

Here warts and all is my review.

The Technical Specifications of The Cornet ED78S EMF Meter

Cornet ED78S RF and Magnetic Field meterFor the purists this is what the Cornet ED78S boils down to:

Dual operation mode: Radio Frequency meter mode and Gauss (LF) meter mode

RF meter frequency range: 100MHz to 8GHz

Sensitivity: 14 mV/m to 26.2 V/m (RF meter), 0.1 mG to 600 mG (Gauss meter).

Gauss meter frequency range: 50Hz to 10KHz

LF600 mode: 50Hz to 10KHz (0.1uT to 60uT)/(1mG to 600mG).

LF30 mode: 50Hz to 1KHz (0.01uT to 1uT)/(0.1mG to 10mG)

Sampling rate: 3500/sec. Display update rate: 2/sec.

Error rate: +/- 3.5dBm

Audio Sound ON/OFF control, programmable Alarm triggering level.

LCD Histogram and bar display to display power density level.

Built-in Antenna.

Compact size, 69mmX110mm.

Battery operated (9V DC)

If at this stage you’re thinking ‘OK but what does all this mean’? Watch this short video to get clear on what this meter is really about (to watch the video click the image below):

Why Would You Buy The Cornet ED78S?

You’d buy this meter because you wanted to measure the EMFs in your environment. OK, but what EMFs?

This meter measures 2 types of EMFs:

radio frequency radiation. Thats to say EMFs from things like

– cell phones and smart phones

– smart meters

– cell phone towers (base stations)

– WiFi routers and modems

– Cordless (DECT) phones

– Wimax

– Spy cameras

– Digital baby monitors

– Digital TV

– A/V Sender Receivers

– Wireless burglar alarms

– Wireless video games (Playsation 3 and the like)

magnetic fields: Thats to say EMFs from things like:

– electrical powerlines

– your house wiring

– electrical substation EMFs

Why I Like The Cornet ED78S EMF Meter

  1. Its like having 2 meters in one. This is not unique. Cornet have done this before with the Cornet ED75. But the ED78S is a better meter than the ED75 both for RF readings, it measures up to 8 Ghz (the ED75 only measures to 6 Ghz) and for magnetic field readings  it measures right from 0.1 mG (the ED75 measures from 1 mG). It also costs more than the ED75.
  2. Its sensitivity. It has two magnetic field settings, on the lowest one not only does it measure magnetic fields from 0.1 mG to 10 mG, but it also has a resolution of 0.1 mG. This means its very sensitive (ED75 has a resolution of 0.5 mG).
  3. The sound function. I’m a big fan of being able to hear the EMFs because it conveys so much information. While I was testing I noticed I was picking up RF radiation on the audio which was not reflected on the display. Getting information on extremely low levels of EMFs is important. The more sensitive your EMF meter is, the better. Having this sound function definitely improves this aspect.
  4. The histogram function. Its the little box on the right of the LCD display. It shows the last 32 readings since you switched the meter on. This is ideal for measuring smart meter radiation which comes in short bursts. Because the ED78S samples 3500 times per second it can pick up things you might miss, having the histogram and maximum signal level makes it easy to observe these bursts.
  5. Its price. It’s currently sold around $10 cheaper than the Cornet ED85EX. Given that you get a magnetic field meter with the ED78S (the ED85EX only measures RF radiation) this does seem a much better deal. In its defense the ED85EX still has a slightly broader range than the ED78S (1MHz to 8GHz, compared to 100MHz to 8GHz for the ED78S) and the ED85EX offers the possibility of being able to connect an external antenna, which the ED78S does not.

What I Didn’t Like About This Meter

  1. The choice of measurement units. For magnetic field mode it gives you the main reading in Tesla. You have to look underneath at the small figures to get the milligauss reading (most of the international standards refer to mG). For RF mode the default setting is on mW/m2 (milliwatts per square meter). For biological measurements, which is what we are interested in, V/m (volts per meter) is better. But to be fair you can go into the menu and change it to V/m. Press down the hold button while pressing on the mode button to get into the menu.
  2. It can’t measure LF electrical field radiation. It’s not really a fair criticism, but if this meter could also measure electrical fields it would stand head and shoulders above the others. Remember the Trifield 100XE can measure electric fields, magnetic fields and RF radiation. And on the 0-3 magnetic field setting the Trifield is more sensitive than the ED78S.  But then the RF meter setting on the Trifield is such a blunt instrument its of very limited use.

Where Can You Buy The Cornet ED78S EMF Meter?

You can buy it from this company. Their customer service is excellent (90 day money back guarantee – if you’re not satisfied they really do refund) and they offer free worldwide shipping. If you’ve any questions on the Cornet ED78S EMF meter you can put your question in the comment box below, and I’ll do my best to answer.

This article was last updated February 2015.


  • David McElroy said,

    Measuring EMF might be useful, but I doubt there is anyplace on Earth we can actually escape all the electronic radiation. We should press for independent research on the effects of EMF on living creatures and our mental health in particular. Such research should be widely published and used to mitigate the risks (and nefarious uses) of EMF.

  • Lynn D said,

    What gives off EF ? Can EF be reduced by placement ( or we can remove item ).

    just found this, is it an ap or a meter?

    If you were going to get just one meter, would it be tri field or this? or a giegahertz 3030B
    Lynn D

  • Lloyd said,

    I talk mainly about EMFs (electromagnetic fields) …..EFs…electric fields are only one element of this. Anything electrical can create an EMF. Increasing the distance between you and the EMF source will always reduce your exposure. The link you refer to….not sure what this is….there are many EMF meters on the market….some of them are so inaccurate and insensitive they are basically useless…and a waste of money…the EMF meters I have tested and recommend are on this website. What meter you buy depends on what kind of EMF you want to measure…my free EMF protection report can help you get clear on this.

  • Marian said,

    Hi Lloyd,
    Thank you for all the information. I am feeling sick with all the computer, upcs, routers, etc in my office.
    I am in the process to buy my first emf meter and also would like to know what should I use as a shield to put between me and all the equipments

  • Lloyd said,

    Hi Marian
    The best ‘shield’ is distance…..also think in terms of eliminating WiFi, external wired keyboard, external wired mouse, grounding your computer equipment…for more information on this, see

  • Chantal Blais said,

    I do have a ED 85EX and it do not mesure the 4G antenna. Is this new one will be able to detect them?
    Thank you!

  • Lloyd said,

    For RF measurements (2G, 3G, 4G etc) the ED 85 EX is the better choice. But both the Cornet ED 85EX and ED78S will measure 4G.

  • Kitty said,

    I’m new to the EMF topic and I’m having trouble digesting all the specs and info. What model do you recommend for basic household use, the Comet or the Trifield? I’m interested in quality and ease of use. Rechargeable is nice too. What types of things emit LF’s? Also where can I locate recommended limits for immediate surrounds?

  • Lloyd said,

    The first thing is to get clear on what you want to measure around the house. If you want to measure mainly magnetic fields and electric fields then the Trifield 100 XE is a good starter meter. If you want to measure magnetic fields and RF radiation (EMFs from things like WiFi, cell phones and smart meters) then the Cornet ED78S is a better choice. LFs…low frequency fields…usually refers to magnetic fields…download my free EMF protection report to better understand the issues and terminology.

  • LEO G YOUNGER said,

    Thanks. I ordered the ED78S. Hybrid vehicles with their large batteries & electric motors which stop & start frequently, are of concern regarding health of the driver & passengers. Which meter would be best to assess fields adverse to health when using such vehicles?

  • Lloyd said,

    There may be some electrical fields but the biggest EMF problem in vehicles is generally DC magnetic fields – this what I’ve found. The ED78S is designed to measure AC magnetic fields….it will only give an indication of the DC magnetic fields in vehicles. If you want an accurate reading you will need a DC milligauss meter, sell an AC/DC Milligauss meter suitable for this purpose.

  • Nathan Woodhouse said,

    Are there any meters that measure just the 50Hz (mains frequency in Australia) without including below 49Hz and above 51Hz?

  • Lloyd said,

    All the EMF meters I’ve reviewed give just a global reading- for health this is what you need to know. If you want to be able to obtain readings of EMFs at different frequencies you need to buy a spectrum analyzer.

  • G WARDNER said,

    i tried to order the new cornet meter you suggest but they do not accept my mastercard??? I was in a hurry to get this meter but now i am leary that they do not accept mastercard…. help thnx

  • Lloyd said,

    There is a link on my review above to order through Radmeters, they accept Visa and Mastercard.

  • Jack Small said,

    Thank you for your response. I have the Trified Full Spectrum Electromagnetic Meter. Do you sell or can let me know where I can get a emf protector to pt on me phone in my cordless phone in my office. I don’t use my cell phone on regular basis. However,
    I am also on my cordless phone .

    Thank you, Jack Small

  • Lloyd said,

    I’m not sure what you mean by ‘EMF protector’ – if you mean a chip or diode which you stick on your phone which is supposed to protect you from EMFs, I suggest you read my EMF protection free report first, which lays out the dangers of these kinds of devices and what real solutions can be applied.

  • George K. said,

    Hi Lloyd,
    Thanks for the review, I purchased this device some weeks ago after I have read most of your reviews on EMF meters and I’m really happy with it. I think it’s a great meter considering its features and the price.
    My only concern is about the +/- 3.5dBm error rate which I don’t really know how to ‘project’ on the readings I am getting on the display.
    Could you please provide some explanation on this with some examples ?
    Let’s say, I have a reading of 0.1 mW/m2. What is the range of possible real values ? Same for 1 mW/m2 or 10 mW/m2.
    Thanks a lot!

  • Lloyd said,

    Hi George
    Cornets measurement units of dBm are confusing. 0.1mW/m2 (which is 100uW/m2) is ~-37.5 dBm so the upper error value can be -34dBm (add 3.5) which is 0.23mW/m2 and the lower error value -41dBm which is 0.046mW/m2

    So when the meter shows a reading of 0.1mW/m2 the actual reading is between 0.046 mW/m2 and 0.23mW/m2.

  • luis marquez said,

    Hello Lloyd, I’m still waiting for your take on carbon based paints or aluminum panels to protect the inside of my condo.

  • Lloyd said,

    Using a high frequency shielding paint like Yshield is the easiest solution….these paints are easy to apply and if after applying you are still getting a reading you can apply more coats as necessary. For more tips on shielding see,

  • Rob said,

    Re: WiFi Meter (plus, info on wi-fi sheilding material).

    Thanks Lloyd,

    Actually I bought one of these meters 5 years ago in the UK for around 70 squids, and its worked well all this time. (I repair PCs and provide an ElectroSmog consultation service for my customers, and this meter is the only tool I require for detection purposes).

    The negatives are: A protruding on/off switch, which means its quite prone to accidental switching on. I’ve largely gotten around this problem by placing three of those little oblong ‘sticky fixers’ around the switch to create a sort of protective sponge wall. I then pop the meter into a padded pencil case for safe keeping as no case was supplied with my meter.

    My second gripe is the battery housing. Once the battery is pushed (jammed) into this meter it often requires a screwdriver to lever the old battery out again. In fact recently I had to remove the meter’s back cover in order to get the battery out -and annoyingly bits of switch cover etc fell out.

    My third gripe is the lack of an ‘auto-shutoff’ faculty, which of course would prevent the battery being totally run down if left on by mistake. This feature may have been added in later models.

    Finally, on my model the back-light only stays on for about 20 seconds before annoyingly switching off to save power. It would be good to be able to increase the back-light time; and again this feature may be added in newer models.


    Cheap Wi-Fi shielding

    Just to mention that I discovered some cheap and quite effective shielding the other day by mistake. Last week I ordered a 5-pack of those emergency foil ‘space blankets’ (£5 from Amazon) and I was delighted to find that they are around 90% effective* in blocking wi-fi radiation. In addition they are also very large and lightweight, meaning you could probably cover an entire wall of a large room with just three or four of them.

    These foil space blankets also double as a sort of makeshift wi-fi shield when you’re in a hotel etc – and they can be easily draped over the head of the bed to protect your head while sleeping. (Some blue tack and strong thread would be useful to better place the shield, or drape it over your hotel bed). Or heck, just tape two blankets together to create a very warm! ‘anti wifi’ shield sleeping bag.

    * Note that I’ve only tested the foil blankets on a Netgear wi-fi router. In order to put it through its paces I also need to test it on something more powerful -such as a BT HomeHub router, and perhaps a cordless phone/base station, as these often admit much higher wifi output than the Netgear. But so far so good
    (It may be that I’ll need to double the foil blanket over in order to increase its blocking potential against more powerful wireless devices).

  • Lloyd said,

    Hi Rob
    The meter you bought 5 years ago can’t be the same one I have reviewed above….the Cornet ED78S has only been out a few months. All the Cornet meters look the same….the same case is used for lots of different models….but technically the meters are constantly evolving. The backlight can now be switched on and off using the hold function….an auto shut off would be an asset.
    Space blankets are a good low cost shielding solution but a word of warning…..using them to cover routers/modems and the like…..this can cause the device in question to power up their radiation emissions (many devices now increase their signal as and when necessary) which is counterproductive….the second point is, covering these devices in this way can be a fire hazard.

  • Rob said,

    Lloyd wrote…
    “Space blankets are a good low cost shielding solution but a word of warning…..using them to cover routers/modems and the like…..this can cause the device in question to power up their radiation emissions..”

    Good point Lloyd. But personally I dont tend to cover routers etc with the foil blankets, but instead I use them as a sheild.

    Regarding the meter. Mine is the Cornet ED25. Its still going strong after all these years.

  • Andrew said,

    Lloyd, what is the difference between the ED78S and the ED78G? Thank you.

  • Lloyd said,

    There is no difference. There is only one model for the ED78. For some reason the manufacturer sometimes calls it the ED78S and sometimes they call it the ED78G…..they are the same meters.

  • clyde said,

    Hi Lloyd, Good day, i have neurological movement disorder about 4 years of pain and suffering til present. I just want to know if E-smog is causing me to have a neurological movement disorder. what the best EMF meter? which one EMF meter can you recommend (analog or digital EMF meter)? Thank you

  • Lloyd said,

    Hi Clyde
    As far as I know there have been no studies done on the link between EMF exposures and neurological movement disorder specifically. But the studies are saying that EMFs cause neurological damage…..EMFs are extremely biologically active. Unfortunately there’s no one meter that can measure everything….a good starter meter is the Cornet ED78S. My EMF protection report is another good source of information on the subject.

  • David said,

    Is this meter suitable for both 50 and 60 hertz electrical systems

  • Lloyd said,

    Yes, the ED78S will give reliable readings on 50 or 60Hz electrical supplies.

  • Peter said,

    Thanks for all the information Lloyd.

    Is the ED78S single axis? I want to get a single axis meter because it would make it easier to determine the sources of radiation.

    If the ED78S is not single axis then perhaps the Cornet ED85EX would be a better choice for me because it is single axis?

  • Lloyd said,

    Hi Peter
    The Cornet ED78S is a single axis meter, as is the ED85EX.

  • Chris Gupta said,

    Hi Lloyd,

    I have send a query twice to [email protected], [email protected] as well via their web based input with no response. Needless to say I am a bit reluctant to buy from then, if they don’t even have the courtesy to respond on queries on your products. I am wondering if you have their phone # or some ohter way to get in touch with them?


    Chris Gupta

  • Lloyd said,

    Hi Chris
    I can only go on my experience with Radmeters which is that the service is very good. Emails can go undelivered or can go into a spam folder. Unfortunately I don’t have another email address for them. Try sending your question from a different email address.

  • David said,

    Have had good feedback from the Cornet
    suppliers on order processing for the model we have
    just purchased.

  • Chris Gupta said,

    Thanks Lloyd, I tried again and finally got an answere for some reason they did not get my earlier enquires.

  • alexandra said,

    How long takes delivery to Australia
    Best Regards Alexandra

  • Lloyd said,

    I don’t sell this meter. For delivery information you need to contact the seller above.

  • David said,

    It took one week from Israel to New Zealand

  • EHP said,

    I am looking for a meter to measure EMF from a neighborhood power pole and measure EMF from the panel where electricity enters our house. What meter is best, Trifold 100xe? Looks like if I get Trifield meter then I will need a second to measure RF from cell phones, etc. What second meter would you recommend? Thx.

  • Lloyd said,

    The Cornet ED78S will measure magnetic fields from powerlines (generally considered to be the most dangerous element). But unlike the Trifield it will not measure electric fields….no one meter can measure everything…. but from what you are telling me the ED78S would be well suited for your needs. If you buy the Trifield first a good second meter would be the ED78S.

  • metatech said,

    Thanks Lloyd for this review, the ED78S seems to be the best compromise in todays’s EMF meters.
    I had some questions : does the measurement unit return to default on each off/on or is it permanently saved after being saved in the setup menu ?
    How do you disable the sound output ? Can the alarm be disabled separately from the sound output, or is it required to configure the alarm to a very high threshold to effectively disable it ?
    Thanks !

  • Lloyd said,

    – The measurement units remain as you saved them in the setup menu.
    – To activate the sound output you press and hold the upper black button and then click the lower black button and release both. In the same way you can turn the sound output off. If the meter is turned off and on the sound function will be off. The Alarm and sound output are different functions they can be disabled separately.
    – The alarm is configured in the setup menu. It can be either disabled or a threshold can be selected.

  • metatech said,

    Thanks Lloyd for your precise answers.
    I have some more questions : isn’t the sound a bit weak ? On the video, the sound is not easy to hear behind your voice. Is there a sound volume configuration ? or a headphone connector ?

  • Lloyd said,

    I think the audio sounding weak is more to do with the quality of my video than the sound function on the meter…the sound is quite clear. There’s no external jack to connect headphones….the Acoustimeter has an external jack.

  • PB said,

    For the new smart meters (for homes) being installed (some Californian’s fighting against forced installations) how would you shield your home from RFs if it is reading all smart appliances. (Don’t have this meter yet or Smart appliances, but supposedly all houses and appliances are going this way.) What kind of hertz are used in these meters?


  • Lloyd said,

    See this post on smart meter shielding, These meters emit radio frequency radiation in the Ghz range. For a better understanding of how smart meters work, see
    Also, whether you have a smart meter or not, smart appliances will emit radiation into your home – you need to make sure you don’t equip your home with smart appliances.

  • Dag Inge Hansen said,

    I was exposed to WLAN/WIFI at work for about 5 years, with a distance of 2 meters or so. Now I have had some D-vitamin deficiency last year, that I thought were the real problem (diag. feb 2012), but now after another year with a very good recovery from this. I was now found myself working about 3 meters from a DECT-antenna in the hall for 10 months now. And I still couldn’t recover from the nose-bleeds that I have had for years (think about 2008 it started after I was under the WIFI exposure). Now I have discovered for about three weeks started to look for info about microwave radiation and what controversy this is and all the symptoms seem to fit me well. I just ordered this meter and are hopefull to measure my exposure. It’s also looking good at work because them are going to remove DECT-system as its getting old now.

  • Sim said,

    Thanks for all your Reviews. I’m quite affected by Smart Meter radiation (and also Mobile phones) but I’d also like to test around the house for other problem devices. So here are my queries?

    1) Would I be better off getting a Cornet ED78S or the Gigaherz combo of the ME3830B and the HF35C. I do realise that the latter option (2 separate meters) is about 3.5 times the price of the single Cornet meter but I’m asking if it’s worth it. Will the Gigaherz Meters give more accurate readings and be nicer to use? What would you say are the advantages/disadvantages?

    2) Once you have detected the sources and areas of high readings, what’s the best way to block them … and in particular, for a Smart Meter, you mention that, “the best solution is probably to use a reflector shield with shielding fabric directly behind the meter. And then an absorber shield, microwave absorber sheet for instance, on top of that.” So you think RIPSTOP SILVER FABRIC with MICROWAVE ABSORBING SHEET on top is best. Would Riptop Silver be better than Naturell? Would plain household foil or aluminium mesh flywire do the same job? How large should the shield be?

    3) Also if the Smart Meter happens to be installed on a board on an external wall so that there’s a little bit of wiggle room, would it be better to put the shield directly behind that board so that the shield would virtually be touching the Meter or would it be better to put the shield on the internal wall behind the meter so that there would be about 8 inches between the meter and the shield?

    Thanks again for this site and all your assistance.

  • Lloyd said,

    1. It all depends on your budget. Given that you are experiencing symptoms of sensitivity you want to buy the best meter/s you can afford – no meter is going to be as sensitive to EMFs as you are. I can’t comment on the HF35C because I’ve never tested it but if your budget is limited the ED78S is a very good buy….if you have the financial means to buy an Acoustimeter to measure RF radiation then thats my preferred choice – see my meter reviews.
    2 & 3.The best way to deal with EMFs depends on the particular circumstances of the situation and again, your budget. With a smart meter, you must first exhaust all options for getting it removed by the utility company or by your own electrician before looking into shielding. There are 1000 and one ways to shield. Inexpensive materials like aluminum flywire can be very effective….if you have a good meter you can apply shielding, test to see the effectiveness and then re-shield as necessary.

  • Concerned Tenant said,

    I am concerned about the fact that I am living directly underneath a cellphone antenna so I came across your site looking for a meter that I should invest in. I was also recommended the Electrosmog 8Ghz RF meter or the HF Meter. However both are out of my budget. Does the Cornet ED78S EMF Meter detect cell antennas, directly above me (on my roof) and also up to 50 meters (roughly one apartment block away)? It says that it detects cell towers but I wanted to know if they detected cell antennas as well. Thank you again.

  • Concerned Tenant said,

    I also wanted to ask, what would you recommend as the best meter to measure EMF from cellphone antennas (I want to make sure I’m not exposed to it), below $200. Thank you again Lloyd.

  • Lloyd said,

    Just to be clear, cell towers are equipped with cell antennas which emit RF radiation….the Cornet ED78S is sufficiently sensitive and accurate to measure RF radiation from cell antennas.

  • Lloyd said,

    With a budget of $200 its difficult to do better than the ED78S….the Acoustimeter is a better meter but its a lot more expensive, see

  • Jennifer Brushaber said,

    I have this exact model (ED78S), but it’s not picking up the smart meters in my neighborhood. I do not have a smart meter on my house, which I wanted to confirm and compare against the smart meters in the neighborhood. What type of reading should I expect to see from the smart meeting? Could I be doing something wrong?

  • Lloyd said,

    Smart meters emit relatively weak RF signals so you can expect readings below 1 V/m…..I suggest going to where the smart meters are in your neighborhood and testing there….stand withing 6 feet….some smart meters are not emitting all the time so you may have to test at different times of the day. You also need to use your meter around other RF sources…WiFi, cell phone etc…if you aren’t getting any readings then it would indicate that your Cornet meter is defective….in which case you need to send it back.

  • Alex said,

    Hello Lioyd,

    I have some questions to ask you.

    1. Have you compared the rf level measuring from Cornet ED78s and Acoustimeter?
    2. Does Cornet ED78s measure the peak or average strength?
    3. In the Cornet ED78s manual page, if the dBm uint is selected, it shows signal power level (-30 dBm) and field strength level (0.580 mw/m^2). What diferences are they (field strength and signal powers)? The reason I ask is I look at the emf unit conversion table—30 dBm is equal to 0.121 mw/m^2.
    4. Also in the Cornet ED78s manual page if the V/m uint is selected, it shows current field strenth 0.58 V/m, Max signal level 1.530, and the another reading without any explanation is A 0.53. I would like to ask what is meaning of the last reading (A 0.53)?


  • Lloyd said,

    I’ve compared the ED78 and the Acoustimeter….the Acoustimeter is the better of the two.
    The Cornet meters take 3000 measurements each 0.5 seconds and show the peak (max) value of them…. as for your other questions….these are quite technical…. I don’t want to mislead you…. I suggest you contact the manufacturer about this.

  • Barbara said,

    I wanted to know whether you knew anything about a SOEKS meter. Have you ever reviewed it? It is made in Russia and looks pretty impressive, but would like your comments before we go ahead and buy one.

  • Lloyd said,

    I’ve not reviewed this meter but I just googled it. I found the company that’s selling it – careful this meter measures in microsieverts (μSv / h) which is a measuring unit for radioactivity. This meter is not suitable for measuring EMFs round the home. My Free report talks about what EMFs you need to measure and what meters are suitable.

  • Jerome Roberts said,

    Many thanks for the excellent review.

  • Dag Inge Hansen said,

    I now have used this excellent meter for a few weeks, and are pleased with it. My exposures came mainly from work. (DECT & WIFI) The levels from my last exposed workplace of 10 months was in the red: 90mW/m2 peak, and 40mW/m2 average. Noticed also the workplace besides the WIFI at 15mW/m2 peak and 0.02mW/m2 average. The exposure at home was low, and in the safe sone. I can actually switch off the routers wifi-mode locally, and saw clear readings on the meter. I would recomend this meter (from as a good and nescessary tool for detecting wifi, wireless, base-stations, smartmeter, etc…

  • kim said,

    Just received Cornet ED78S ( on your advice, big step, selecting a meter !) …
    … when I touch the side of the meter w/ my left hand, the measurements went up by 10 X factor. (reading of 1.25 would change to 12.5 if I touched meter….reading of 5.22 would shoot up to 52.00 w/ red/danger lights blinking )…but only w/ left hand touching it. Right hand touching same spot, meter in same spot…only 3 X increase. Course, wanna know why. The vendor couldn’t say why ( ” touching the meter may make numbers increase slightly” …end of discussion.

    ….it gets more perplexing…I went to a friends office to demonstrate this phenomenon, and it didn’t happen at her office( touching meter made no change ). Came back and double checked at home…same thing…10 x increase in reading when touching, or holding meter in Left hand.

    …I didn’t expect to have more questions than answers in finally purchasing a meter !!

  • Lloyd said,

    There are 2 possible explanations I can think of:
    1. your meter is faulty
    2. there is some kind of distorting effect when you touch your meter which varies depending on the environment you are in, different environments react differently because RF radiation interacts with different materials and surfaces differently. What really counts is that your meter gives you reliable readings when holding the meter normally.
    If you are withing the 60 day period you are within your rights to request a refund.

  • Louay said,

    I was wondering whether you have ever measured the EMF readings for a google nexus or Amazon kindle device. I would love to know how much EMF they give off as I have a google nexus and was thinking of getting a kindle but then wondered how much EMF they emit. I asked the same question to another EMF website and they responded by saying:

    “I’ve not measured the Google Nexus, but I have measured the Amazon Kindle which produces zero EMF while you are using it, except while you are downloading stuff onto it. Then it is a bit like a cellphone, except that you do not stick in right to your ear!

    I imagine the Google device is similar. I don’t think you need to worry too much about this kind of device. I recommend you don’t hold them while they are uploading or downloading. Otherwise they should be perfectly safe.”

    Looking for a second opinion. :-)

  • Lloyd said,

    I’ve not tested either of these devices – sorry I can’t be of more help.

  • crystal said,

    Do you think solar panel on the roof would intensify readings?

  • Lloyd said,

    Its very possible….the problem is not the solar panels themselves its the accompanying electronics which create EMFs….solar power installations create DC, a device called an inverter is then used to convert this low voltage DC to mains AC….2 issues 1. inverters and their cabling can be a source of electric and magnetic fields, 2.inverters can also introduce dirty electricity.

  • Margie said,

    Hi Lloyd,
    I cannot afford to buy more than 1 meter for testing at present time and I was thinking of buying the ‘Cornet ED78S’, to test if my shielding that I am putting up to protect against the smart meter and cell phone tower (which is within 400M from us ) is doing a good job or not.
    I also wanted a meter that would tell me when I was running into Wi-Fi and RFs when I was out of the house plus try and show people what their cell phones, microwaves and wireless devices were doing.

    I am also hearing that they are in the process of uping cell phone towers to 4G/LTE, which will mean even greater risks to our health.

    You now have the new ‘acoustimeter meter’ review out and I am not sure which to buy.
    Could you suggest which one would work better for these types of applications ?

  • Lloyd said,

    Both the Acousticom 2 and ED78S will work well for what you are doing. It really boils down to what you are looking….the Acousticom 2 is smaller and slightly more sensitive (which is a big deal if you are ES) but it only gives an indication of the reading and no recording of the data… the ED78S has better functionality….an LCD display and last 30 readings recorded etc.

  • crystal said,

    Do you think audio professional mixing studio gear (mixing board, rack mounted compressors, effects units ect) in a big room downstairs would have much effect on me upstairs in my house?

  • Lloyd said,

    There are two possible EMF sources that come to mind 1. RF radiation from wireless microphones and instruments 2. dirty electricity pollution. Given the electrical equipment its very possible that your DE pollution levels could be elevated when this equipment is plugged in, you can easily test this with a GS meter, see

  • Hillary said,

    Hi Lloyd,

    Over the past two years, I have developed HORRIBLE eczema. I’ve had hand eczema for years now, but suddenly it seemed, it went from there to full-blown, full-body eczema. My skin is at times unbearably itchy, and is red, like a terrible sunburn (that’s how it feels too). It is so dry, it’s almost like it repels moisture. I am miserable. All I could think that changed was that around that time we had two smart meters installed in our two-family home. We used to have tenant but we took over the whole house, so now we’re also living on the first floor, where the meters are installed. I spend a great deal of my working day working on my laptop and in the living room–about one to two feet away from the meters. What’s your take on this? My next step? Could there be a real connection there? Thank you so much for all your dedication to this cause!

  • Lloyd Burrell said,

    Hi Hillary
    I’ve had other reports from people linking EMF exposures to eczema though I know of no study on this. I’ve also noticed that EMF exposures tend to hone in on your weaknesses, so whatever health complaint you have already when you add EMFs into the equation it gets worse….so what your explaining is very possible. Your next step is to deal with these exposures, my EMF protection Free Report is a good place to start.

  • Crystal said,

    Hi, Lloyd,

    We appreciate all that your doing to educate we the people in such a tech driven society. I have a question for you. My son has chosen to conduct his science fair project on the dangers of cell phone radiation for children. With this said we are having a really rough time locating an inexpensive radiation meter for his prodject. Do have any suggestions.


  • Lloyd Burrell said,

    Hi Crystal
    There are some very cheap meters around but as with most things you get what you pay for EMF meters…unless your meter has good sensitivity & accuracy you can easily waste your money. The cheapest meter I have tested for cell phone radiation is the Cornet ED75 – see my review.

  • Tom said,

    Thanks for all the info.

    1) What are your thoughts on indoor amplified antennas? I was told they are just receiving instruments and therefore are safe.
    2) I have turned off my wifi router and plug my laptop into the modem. Do you recommend I shut off the intel wifi driver on the laptop?

    Thanks again

  • Lloyd Burrell said,

    Hi Tom
    1.Amplified antennas are in theory just receiving instruments and so you wouldn’t expect to pick up a reading with an EMF meter….but there are possible subtle energy effects you may feel from being in proximity to such an antenna…….. which are difficult/impossible to measure

    2. Yes, shut the WiFi off on the computer also to avoid WiFi radiation from your laptop.

  • Jean said,

    I’ve purchased a Cornet ED78S for measuring reads from a power line communication “wired” smart meter because my Gigahertz solutions HF 35C is not picking up measures or sounds of 800Mhz to 2.4Ghz at my current residence. However, when measuring the same smart electric meters-with the same faceplate and writing- in the same power company’s territory, I’ve found they are programmed differently in different neighborhoods. Some have a constant wireless function while others do not. At my current home, the Cornet78ED shows following reads when I place the Cornet right up to the faceplate of the electric meter: continual pulses varying around 1.62 mW/m2; LF600= continual varying pulses around 35.00uT: LF30= 0.L uT maxed out continually.

    The thing is that I am lost as to what these reads mean. In other words am I getting reads from the SMPS- switching mode power supply, or is it the radio frequency being injected into the 60 Hz signal as it enters the home, and how “bad” are these reads?

    As a side note – I developed electro sensitivity right after this type of wired smart meter was placed on my former house – it was measuring constant pulsing microwaves with the HF35C. The ES symptoms continue at my current house to a lesser degree.

  • Lloyd Burrell said,

    A good indication of what these readings mean is to look at the LED display on the meter. The RF readings are your main concern here….. 1.62 mW/m2 is in the yellow which is not insignificant…whats more important is to know the ambient RF levels in your home….given the fact that you are experiencing symptoms you may want to consider shielding/having the meter removed.

  • Jason said,

    Hi Lloyd, I read through your website and EMF report and have also recently received my purchase of the Cornet ED78S. I have not been able to find any good information on what are considered “safe” RF or EMF levels. I live near a cell phone tower and outside my home my meter says 0.05mW/m2. How does this differ from W/m2 and what would you consider “safe?” Is there a good website that has a conversion table with levels that I might compare too? Thanks very much. Jason

  • Lloyd Burrell said,

    Hi Jason
    The ED78S gives an indication of whats ‘safe’ with the colors next to the LED lights….0.05mW/m2 is attributed a green color coding…. but there is no absolute safe level of RF radiation….studies are discovering adverse biological effects at lower and lower levels – see the BioInitiative Report 2012. For an understanding of the different measuring units see,

  • Alan said,

    I sent some comments/questions a week or two ago and don’t see where you responded. Could it be that you did respond and I just missed the response?

    Basically, I am looking for a more simple explanation of everything. i.e. a blog for dummies section. We are now on our third meter, Cornet ED-85EXS, 4190 F.W. Bell Gauss/Tesla Meter, and now a Stetzerizer Microsurge Meter model GS-M300-A, Graham Stetzer Filters Model GS-F110-A,

    1. What does each meter measure?
    2. Is there any duplication in what they measure
    3. The Cornet measures in (3) different ways, which way is best for a lay persons use?
    4. is the term RF a generic term that refers to all the different types of things we are measuring?
    5. I think from reading your blogs that there are different types of bad stuff we should be measuring and protecting against.
    * Electrical transmission lines, all in home appliances w/motors
    * cell towers, cell phones
    * Computer radiation,
    * routers, portable phones, tv’s
    * Dirty electricity

    I am totally confused; is there a place where all the different “waves” can be broken down CLEARLY INTO THEIR SEPERATE CATAGORIES and then match these seperate categories of bad stuff with each type of meter that is needed to measure all this bad stuff.

    I think you and others are assuming we know what you are talking about…. please , please “simplify it down to a lower level” there are a lot of DUMMIES OUT here me included when it comes to this type of stuff.


  • Lloyd Burrell said,

    Hi Alan
    I never saw your questions 1st time round…apologies….I get many questions a day and try and reply to everyone which sometimes takes days (too long). I hear what you’re saying and you are right. This subject is confusing and no doubt I do assume people understand things they clearly don’t. Here are some quick answers to your questions:
    1. What does each meter measure? —
    Cornet ED-85EXS measures RF radiation
    4190 F.W. Bell Gauss/Tesla Meter measures magnetic fields (I’m not familiar with this meter)
    Stetzerizer Microsurge Meter model GS-M300-A measures dirty electricity
    2. Is there any duplication in what they measure — essentially they all measure different categories of EMFs
    3. The Cornet measures in (3) different ways, which way is best for a lay persons use? Use it on the V/m setting or mW/m2 setting – watch my video to see how to do this.
    4. is the term RF a generic term that refers to all the different types of things we are measuring? No it refers to one type of radiation…radio frequency radiation.
    5. I think from reading your blogs that there are different types of bad stuff we should be measuring and protecting against. I am totally confused; is there a place where all the different “waves” can be broken down CLEARLY INTO THEIR SEPERATE CATAGORIES and then match these seperate categories of bad stuff with each type of meter that is needed to measure all this bad stuff.— yes as follows:
    * Electrical transmission lines, all in home appliances w/motors — magnetic fields (MFs)
    * cell towers, cell phones — RF radiation
    * Computer radiation — all kinds of EMFs
    * routers, portable phones, tv’s — tvs probably dirty electricity and routers, portable phones Rf radiation
    * Dirty electricity
    Download and print out my free report for more information.

  • Sara said,

    They came out with Cornet ED85EXS how do you compare this with the Cornet ED78S? I want to buy a meter as soon as possible I want to measure around the house my house meter and my car. Should I get the latest version the ED85EXS or the ED783 is best.

  • Ken Crispin said,

    Hi Lloyd,
    I just received my ED 78S yesterday from RADMETERS, and having trouble turning on the backlight with my hold button. Also I do not get the RF side of the meter to accurately operate.
    At first it monitored variation levels of RF but now it switches on to go right up to maximum level of 26.22V/M and sets off the alarm, and I cant unlock that mode.

    I tried to reset, and adjust every item in the menu from 1 to 7 and it is locked there.
    Can you help or should I return it for another one, as the backlight option you offer does not work also?

    I would appreciate some advise. Can I dump all the memory and start again another way, I tried to remove the battery and start again but it still goes to RF 36.22 V/M and alarm goes off.
    The LF side works fine both levels though.

  • Ken Crispin said,

    I took out the battery again and pushed hold and mode buttons to try and purge the memory, and put it back together, and the RF goes into search mode with the historograph brushing across the small screen but there is no sampling taking place at all and the large screen shows 0.0006mW/m2, so does this mean it is malfunctioning in the RF sensor? thanks ken.

  • Lloyd Burrell said,

    Hi Ken
    It sounds like your meter is malfunctioning….it happens – I suggest you contact Radmeters about this.

  • Pat said,

    Hi Lloyd,
    Thank you for your responses to my previous questions. I did purchase the Coronet ED-78S meter and it is an eye opener to see the various readings around the house. My original reason for purchasing it was to test an ethernet cable outlet in my daughter’s dorm room, as she sleeps right next to it. The meter seemed to read low in the RF and LF settings around the actual outlet so I felt relieved. However, the wires that supply the outlet are encased in metal that run across the ceiling above her bunk bed. I noticed at 1 spot along the line, where there was an opening in the metal seam, the lowest LF30 reading read at .5 and the lower red lights went on. I’m confused as to how serious it is with the lowest LF reading, if the higher LF600 and RF reading did not register as concerning. Is there a source that explains the differences between the LF readings and at what point/number that they become concerning? The meter did not come with that sort of explanation. My guess is anything that gets into the red light section is more concerning, but maybe the lower LF30 is less concerning? Thanks for your advice, Pat

  • Lloyd Burrell said,

    Hi Pat
    The LF30 mode on the ED78S corresponds to the most sensitive setting and 0.5 corresponds to 0.5mG. Neither I nor anyone else can tell you what is absolutely safe but this reading is not particularly alarming. If you are looking for independent guidance I recommend you read the BioInitiative report 2012 and/or the Building Biology guidelines SBM 2008 – both are referenced on this website.

  • Jarkko said,

    Hei! Could you please help me. I am buying my first emf meter. The most important thing is to measure emf around electric wires, cables and gadegets. But i am also interested to see how wifi and 2g, 3g phones transmit.

    What meter do you recommend, ED78S or Trifield 100? Thanks

  • Lloyd Burrell said,

    The Trifield 100XE is not well suited to measuring cell phone radiation, the ED78S is a better choice.

  • kim said,

    Lloyd, could you educate us on the use of the fiberglass rod with the 3030B ? I’ve been taking my 3030B around measuring different people’s EMFs and was in a computer store testing the computers for EMFs … it’s sometimes impossible to connect the ground wire.

  • Lloyd Burrell said,

    I didn’t purchase the fiberglass rod for my 3030B so I can’t vouch for it in practice but I know that the rod is designed to enable you to take more accurate measurements without having to use the ground lead.

  • Brenda said,

    Hi Lloyd… thank you for all the information. I think I have a pretty good grasp of EMF’s after reading various information on your website. What I’m wondering is this… magnetic fields consist of ELF and VLF frequencies. Seems that all the meters you’ve reviewed handle the ELF frequencies just fine. But my understanding is that VLF includes frequencies 10,000 hz and higher. The highest range meters that you’ve reviewed only go up to 10khz (10,000 hz). What types of electronic devices should one be concerned about that are above the 10,000 hz range and are therefore not measurable by the devices you’ve reviewed?

  • Laara said,

    I wear an electric vest on my on my Harley-I am sitting over the battery and other electricals, perhaps a shield under the seat- I am getting arthritis in the SI joint could the fields be making it worse? This Comet ED78S sounds good- but not user friendly- what if I get it and don’t know how to use it- or what values to be concerned with, none of your videos of explaination would load/run for me. Thanks

  • Lloyd Burrell said,

    The biggest problem is likely to be magnetic fields with your Harley…..the Trifield 100 XE is a better choice if ease of operation is a priority for you…..this meter will also measure if there are any electric fields. If the videos won’t run on the site you can view them on my Youtube channel,

  • Jody said,

    I was thinking of either getting this meter or the Acousticom and was wandering, what do you mean when you say its not as sensitive? Will it still pick up the same readings around wifi and smart meters, etc?

  • Lloyd Burrell said,

    By more sensitive I mean that when I switch the two meters on and put them side by side the Acousticom detects low levels of RF radiation that the ED78 cannot detect.

  • Maikki said,

    Hi! Thanks for your great page and info.

    I have a question about ED78S and cellphone radiation. The meter doesnt respond much to 3G phones, but on 2G mode the calls make 100x more radiation. Is it normal? I read somewhere that 2G would be more safe than 3G, but it doesnt seem like it. Thanks

  • Lloyd Burrell said,

    It’s possible that in talk mode your 2G phone emits more RF radiation than your 3G phone…as awareness has grown over the dangers of these technologies cell phone companies have been working to make their phones more efficient and emit less radiation…this still doesn’t make them safe….its where 3G phones are used for data transmission that radiation levels are the highest.

  • Adrienne @ Whole New Mom said,

    Thanks for this. I need to get moving on so many aspects in our home. I heard you mentioned and recommended the Acousticom. Any thoughts on the pros and cons? I would like to get one as soon as possible. Thanks!

  • Lloyd Burrell said,

    The Acousticom 2 is a great little RF meter….its small, its got an excellent microwave detector (the same as its more expensive big brother the Acoustimeter) and for what you get its not overly expensive. This is the meter I like to take with me when I’m out and about – for my full review see

  • DaveA said,

    Hi Lloyd,

    I suffer from EHS, bought your book, and am currently trying to detox my life…

    Recently, worried about possible RF radiation from the neighbours or nearby mobile phone masts, I bought the Cornet ED78S.

    Imagine my surprise to find that I get a fairly substantial RF reading not from these external sources, but from my fairly old electricity meter which – so far as I know – isn’t “smart”.

    The meter is located in my downstairs cloakroom, and results in hotspots in other locations – particularly my hall, but presumably, to a lesser degree, throughout the house.

    Any theories, in general, why this apparently non-smart meter might be emitting RF (i.e. wireless) radiation?

    Thanks in advance.

  • Lloyd Burrell said,

    Testing with an EMF is always eye opening….hotspots are rarely exactly where you expect them. The whole electrical acts to a lesser or greater degree as an antenna picking up and re-transmitting RF radiation from nearby sources….cell towers, radar etc. and any other internal sources you may have in your home, DECT phones, WiFi etc….this is one explanation….

  • Melinda Hood said,

    Hi Lloyd,
    Can you use this meter to measure the electrical charge of the earth…i.e. to see if there is stray electricity moving through the earth underneath you – like when you are out camping.

  • Lloyd Burrell said,

    The ED78S only measures RF radiation Melinda… need a body voltage meter or even a basic multimeter to measure your body voltage which will also indicate the stray voltage you are being subjected to.

  • Jean said,

    @Dave and Lloyd- I would like to know the answer to this also. I do have a smart digital electric meter, but it is of the “wired” variety -which supposedly is not transmitting wirelessly. The “smart” communication is done from the electricity itself through power line communication -PLC – which utilizes an RF pulse injected into to the power signal.

    I have a very sensitive RF analyzer – HF 35C- which does not pick up RF pulses coming from the electric smart meter (and this device is frequently used to measure different utility meters which are wireless) However, when I place the Coronet78S up to the meter it picks up very high RF reads. This doesn’t make sense and I wish someone will find an answer to this conflicting information.

  • Lloyd Burrell said,

    Some smart meter signals are extremely rapid which makes them very difficult to detect….this is the best explanation I have for this.

  • Jerome Roberts said,


    The HF 35C measures only up to 2.5 GHz whilst the Cornet 78S will measure all the way to 8 GHz. There is a lot Wi-Fi is the 4.8/5GHz range. However, most SmartMeters run on the consumer side at 2.4 GHz and up to 1 GHz on the utility side. But, perhaps this meter is an exception. I would trust the Cornet reading because of its greater range.


  • DaveA said,

    Hi Lloyd,

    I’m learning more about my meter-related issues as time goes on…

    My Ampy 5184A electric meter emits RF pulses (i.e. wireless radiation) about every second, which the ED78S measures at up to 1 V/m or so. This happens continuously throughout the day and night, and I think is described as “Automatic Meter Reading” technology – which seems to be the forerunner of “smart” meters.

    I’ve spent hours (literally) on the phone to my energy provider, trying to explain this, and the fact that the constant RF emissions seem to be perpetuating and aggravating my electro-sensitivity.

    Apparently, I’m the first customer they’ve ever spoken to who has this condition, and to say they’re perplexed would be an understatement.

    (I think that with the rollout of smart meters about to start in the UK, I won’t be the last electro-sensitive person to contact them though).

    They’re supposed to be fitting a different meter today to resolve the issue, although re. Jean’s comment, I wouldn’t be surprised if the new meter tries to send RF pulses via power lines rather than wirelessly, and don’t know if this would be better or worse than what I have now.

    I’m sure that the energy company won’t willingly relinquish the ability to automatically (and remotely) monitor my energy consumption…

  • Melinda Hood said,

    Hi Lloyd,
    Thank you for your response regarding measuring the ground when camping.
    I am trying to get myself set up with basic measurement equipment for home and camping/earth voltage measurement.
    Sounds like the Cornet ED78S is good for RF and magnetic fields.
    What do you recommend in terms of body voltage meters or basic multimeters?


  • Lloyd Burrell said,

    A body voltage meter will be more accurate Melinda but a basic multimeter can do nearly as good a job. My Amazon store page lists a model you can buy for around $20, see

  • Carolyn said,

    The battery that came with my ED78S meter only lasted for 1 day, using it only a few hours. Is that normal? If so then it could get VERY expensive using the ED78S meter. I think the low battery was what caused the 1827 reading on the meter which was frozen on the screen and required powering off and back on. With a new battery I’ll see if that is the case.

  • Carolyn said,

    You recommended using V/M readings instead of mW/m2. In your review of the Cornet ED78S, you said “But to be fair you can go into the menu and change it to V/M”. You didn’t mention that the meter won’t hold the changed setting. Each time you power ON you must go into settings and change to V/M. Do you know of an automated conversion web site that will convert mW/m2 to V/M so that I don’t have to change the settings each time I turn the unit on? Thanks.

  • Carolyn said,

    It would be very helpful to know what readings are in your house now…around your computer, printer, cell phone, corded phone, AC plugs, microwave, and anything else in your house, etc. At least I would know what is safe for you and give me something to refer to. Thanks.

  • Lloyd Burrell said,

    This website has a RF converter on it….note: conversions like this have their limitations. The battery that was in your meter when it was delivered was probably already low….a battery will normally last several months.

  • Jean said,

    Hi Lloyd,
    Will the Tenma digit multimeter that you have for sale in your EMF store measure AC body voltage down to 0.004 V ? Does one measure their body voltage with this meter by grabbing on to one end of a test lead – and is a second test lead needed for this measurement?

  • Lloyd Burrell said,

    The Amprobe 5XP-A multimeter would be a better buy Jean….it can measure in millivolts and is more accurate. Put the black probe to earth (electrical socket or other), hold the red probe between your fingers to determine your AC body voltage (when on AC setting) and DC body voltage (on DC setting).

  • Melinda Hood said,

    Thank you Lloyd.

  • Jean said,

    I have complained to my electric company for two years about this wired PLC digital smart meter since I developed ES symptoms soon after installation which includes non-stop ringing in the ears. They tell me I am the only one with the problem and that it’s not being caused by their meter or PLC (power line communication). However, I’ve come to know various local individuals with the same PLC meter who have also developed health problems since installation,and guess what the utility tells them when they call to complain? They say it’s the first time they’ve ever heard of such a thing! A couple of us have submitted letters from our doctors asking for a return of an analog meter because of our associated symptoms, and the utility still says that they absolutely will not do it. It is my understanding though, that if they are using PLC- power line communication- just changing out the meter may not be enough to help a suffering person because much of the problem is coming from the PLC technology where the RF is injected into the power signal and then travels into home wiring and radiates out from the walls wherever the wiring travels in the home.

  • JJ said,

    Hello:Can I use this as a RF leakage meter for a Cable system I run? Will it display a RF specific frequency that it picks up or does it just show the power levels? I would like to see if there are any specific channel leakage.

  • Lloyd Burrell said,

    This meter doesn’t show frequency JJ…’d need a meter with a spectrum analyzer function on it to do that.

  • Kaiser said,

    Hi Lloyd, I have a Cornet ED78s but I have a doubt related to the values showed on the screen, Question: These values reported are the final values or I must to do a multiplication by 100, for example when it display 0.45 V/m = I’m confuse if it is the really 0.45 or I must read it as 45 V/m ?
    In my office the only wireless appliance is a Cordless Panasonic phone (DECT technology) but my RF meter reports 0.461 V/m, so I would like to confirm if it is a well approval value considering the BIOINITIATIVE 2012 suggest the levels recommended is <= 0.614 V/m.

    I appreciate your answer and comments about my doubt to understand the way as this RF Meter works, because I am not sure if the value reports are final or not.

    Thanks a lot.

  • Lloyd Burrell said,

    If your Cornet shows 0.45 then providing its on the V/m setting no calculation is needed…. this means 0.45 V/m.
    Your readings sound plausible….the reading is a reflection of the RF radiation generated by all RF generating devices in the vicinity (cell towers, neighbors WiFi, military installations, etc.)…this is higher than BioInitiative 2012 precautionary level, see

  • Rob said,

    Hi Lloyd,

    Can you clarify how the sound feature works on this meter. It’s not totally clear from the video. I have a Gigahertz HF35C meter. When on, the sound feature continually outputs what the meter is picking up. I know that WiFi makes a continuous pulse sound. In your video, when you turned the WiFi on, there was a small amount of sound, but then the sound stopped. What I’m wondering is whether the sound function behaves just like the HF35C, or whether it makes one sound only when a certain RF level is picked up. To be more precise, can the sound function be used to identify what the RF is coming from (DECT sounds different than WiFi, sounds different than bluetooth, sounds different than a cell tower, etc.).

    Thank you

  • Lloyd Burrell said,

    I’ve never taken the time to analyze the different sounds emitted by the ED78S but I’m sure with practice you would be able to identify the nature of the RF signal (WiFi, cell tower, DECT etc).

  • María del mar Rosa said,

    Hi Lloyd,
    After reading the posts and the comments, I think I am almost determined to get the ED78S.

    I am electrosensitive. When I measured radiation at home, it was up to 4.780mW/m2. Now I have moved to a small village but, if I go to the city, even just a couple of hours, I notice the effect of lampbulbs and also tv and pc screens.
    My question is a bit silly. I still don’t have clear if with this ED78S I can measure these levels (screens and lampbulbs) or if, for that, what I need the trifield meter.

    However, what I am most interested in is in measuring the RF levels because that is what really affects me more.

    Thanks a lot and congratulations for such an excellent work. Your page is of great help.


  • Carolyn said,

    I have the same question as Rob about the different sounds of the ED78S. You said “I’ve never taken the time to analyze the different sounds emitted by the ED78S but I’m sure with practice you would be able to identify the nature of the RF signal (WiFi, cell tower, DECT etc).”

    Since I hear “static” all the time when the meter is on, I can’t really tell when the static is bad or good. Could you possibly do a video identifying the sounds that are “normal” and the ones that show EMF/RF activity? Thanks for all of your excellent research on this subject…which is very new to me.

  • Patty said,

    In its defense the ED85EX still has a slightly broader range than the ED78S (1MHz to 8GHz, compared to 100MHz to 8GHz for the ED78S) – See more at:

    Hi: THX very much for so much info. But I need to know what would fall between 1Mhz to 100Mhz to make ED78s less desirable than ED85EX

  • Lloyd Burrell said,

    The frequency bands that are attributed to different types of devices vary around the world….but TV and radio, mainly analog fall into this frequency range also possibly some digital TV & radio transmissions and possibly military transmissions.

  • Franck said,

    Hi Lloyd,

    I’m trying to understand, if this device (ED78S) can check both RF and EMF, what is the advantage of buying a device qhich can check only EMF (like the Trifield 100XE for example?)

  • Lloyd Burrell said,

    The ED78S measures RF radiation and magnetic fields. The Trifield 100 XE also measures electric fields but the RF radiation measurement capabilities are quite limited…..the ED78S is better choice if you want to measure WiFi, cell tower, cordless phone radiation etc.

  • Franck said,

    Thanks for the answer..
    but i still dont understand what the advantage of buying a device which measures only electric fields like the 100 XE? why should someone buy it instead of buying a device which can measures both?
    for me, I want to measure both electric/magnetic fields and also RF radiation (wifi etc..)
    So i guess the ED78S is the one for me?

  • Lloyd Burrell said,

    The ED78S does not measure electric fields…the 100XE does measure 3 types of EMF but as I said RF sensitivity is limited.

  • Franck said,

    maybe i can do it more simple.. here what i have in my home and i ewould like to test:
    in child room, there is a PC with screen, printer, 2 routers, dect phone,
    in the rest of the house microwave, fridge, freezer, oven, TV, DVD..
    and of course i want to be able to check WIFI, and cellular in the house (coming from inside and outside)

    what meter do u think will be better for me? the ED78?

  • Janet said,

    Hi Lloyd
    Many thanks for this helpful iinformation. I am thinking for people like myself with little knowledge about electrical instruments. Is it better to assume that if I have most common gadgets at home I should just protect myself with a good shield rather than spending money on electrosmog meters. It seems clear that most electrical gadgets emit this harmful radiaitons anyway.
    Another question is. Could this sensitivity lead to my body downloading music from one gadget onto another.No cloud system. Quite weird. Thanks Lloyd

  • Lloyd Burrell said,

    Janet, ‘assuming’ your exposure levels is a recipe for disaster….buying a shield and assuming it reduces your exposure is also dangerous…in some cases EMF shielding can make matters worse…..but an EMF meter can tell you what your exposure levels are and if any EMF mitigation you apply reduces your exposure.

  • Lioness said,

    Hello Lloyd, I’m learning a lot from your book and the web site. Since I use my notebook on my lap while sitting in my recliner 6-8 hours everyday, I had to do something for protection. I have hard-wired it by ethernet. But the big thing I did was to put my laptop cooling pad (not connected electrically though) INSIDE a very large mylar bag used to store dehydrated food. I sealed it using my vacuum sealer (can’t vacuum-just seal). Then wrapped the excess and duct-taped it down. With my ED78 I tested the notebook without the wrapped cooling pad and WITH it. The readings came down quite a lot. Not totally, but enough to be of benefit. I think I will wrap the cooling pad in one more Mylar bag and seal, etc. I’m even thinking of some way to construct a removable “tent” made of this thick mylar to put over my microwave when I want to use it. The readings are in the red zone even when I get out of the kitchen and into the next room. Do you or anyone else have suggestions how to make such a “tent”. I can’t afford expensive options. The meter and your book were about all I could invest. Thanks for all you do Lloyd.

  • Lloyd Burrell said,

    I can’t make any suggestions on how to make a mylar enclosure for your microwave….its not something I’ve ever attempted… thing to bear in mind: microwave ovens are fitted with cooling fans….making an enclosure with Mylar could cause the oven to overheat and be dangerous…..

  • Fausto said,

    Hi Lloyd,

    I bought Cornet ED78S meter and I discovered two main sources of electrosmog in my house: My iPhone and my WiFi router. Surprisingly, if I disabled WiFi in router settings it still remains emitting the same level of radiation. I can’t just change the router because it is provided by my ISP. I discovered too radiation coming from my neighbour. Fortunately my bedrooms, bathrooms and chicken are EMF free. I recommend you people to buy this meter because you can know exactly where radiation is coming from.

  • Claudia LaBorde said,

    I am having unexplained neuropathy so very important I evaluate everything. I have lots of computers, wi fi, and electrical equipment home and work. Should I get the Cornet ED78S EMF or the trifield or both . Or do you suggest a better combo that I could test most everything with ?

  • Lloyd Burrell said,

    If you want to evaluate ‘everything’ you will need more than one EMF meter but just take it one step at a time…..most people start by measuring RF radiation (WiFi, cordless phones, WiFi etc)…..the Acoustimeter or Acousticom 2 are excellent choices for measuring RF radiation….a cheaper solution is the Cornet ED78S which also measures magnetic fields….I suggest you read my reviews before buying these meters and download my Free Report.

  • Veronica said,

    Hi Lloyd,

    I read your site and I would need your help.
    I have no idea which meter to buy, and am I able to buy it from your website?

    I have new roommates on the other side of my bedroom and since they moved in I have chest pain come and go, the whole room feels different now.
    I like to find out if There is dangerous reading coming from my new roommates.

    Please help!

    Thank you and really appreciate it.

  • Lloyd Burrell said,

    The issue may be RF radiation (from cell phones, WiFi etc) from your roommates….I’m guessing….the meter shown on this page is suitable for measuring RF radiation…..but before you go out and buy an EMF meter I suggest you gain a basic understanding of the issue & the different types of EMFs… should find my Free report and newsletters helpful in this also…..then make your choice.

  • June Wood said,

    Hi Lloyd, I have a Triefield Meter and my present home is generally clear of EMF’s.I have a stainless steel screw in my Tibia and 4 root canals. The Previous home I lived in 15 years ago made me and my Family very EMF sensitive in different ways. Because I could sense “electricity” in my body any time an appliance was turned on in any room in the house – I had someone come in and test it for EMF’s. Surprise! His equipment could only measure up to 100 milligaus and the house showed much more. He suggested we call in the Hydro. they came and discovered 150mgs on my bed and very high readings throughout our home. It turned out that our home had no Neutral connected at the Distribution line right outside our home! they fixed the problem – but my daughter and I still suffer from extreme emf problems. It affects my legs – I can sense these awful electric sensations running down all the time. As you have pointed out – none of the gizmos that are supped to help – just don’t. I recently had someone come round and check my outlets for Dirty Electricity. I had $1000 worth of Graham Stetzers installed. Don’t feel any difference, I am now in my Senior years and wonder if I will ever be normal, my immune system is compromised – I have lung bacteria that 3 years of daily antibiotics won’t cure and my mouth and feet ‘burn’ on and off. I put all this down to overexposure in my previous home. Any suggestions that might help me live a few more years without this suffering? I still have a bright mind thankfully. any suggestions would be most helpful. thank you, June, Toronto Canada (no cell phones or WiFi, but next door has Industrial strength WiFi!).

  • kim stewart said,

    June, yes, there is an answer your body…with a sheet, bracelet. earthing or grounding by Ober–google this.
    get the book Earthing by clint ober. On abebooks or amazon for under $10.

    many persons’severe pain/ stiffness/fatigue is eliminated by grounding their body to earth.

  • Arul said,

    Greetings. Thanks for your info and contributions to this field. My query is, how to do I get the readings calculated in dB (like safer range etc -35dB). Could you educate please?

  • Lloyd Burrell said,

    Use the mode button to select the dBm setting. If you are interested in measuring EMFS for health the dBm measurement unit is not suitable….use V/m.

  • Roadie said,

    I have a question about the histogram and the level bar on the bottom. Do you know what’s the scale and unit of the histogram and the level bar? Without the units and the scale, the histogram doesn’t seem to provide much useful information?

  • Mona said,

    Hello! Thanks for your amazing information and time answering questions. The head of our household who is very old, cannot see well, and has a language barrier, unfortunately signed a waiver without realizing what he had signed to accept having a smart meter installed in our primary residence. We received notice that they will be installing it. Unfortunately, the rest of the household was away on extended holiday and business for months and came back to realize this. The electrical company in Vancouver, BC Canada refuses to cancel the installation and will not agree to have someone higher up speak with us and has made threats of charges for failed installation. The installation of the smart meter is about 1 week away. Running out of ideas…? Help! We have our analog meter and want to keep it even with a cost of $35 a month and additional costs.

  • Mona said,

    PS: Fausto, the writer above stated that he had emissions coming off his router even when WIFI turned off. I have the same situation although I don’t know what if or how much emissions. Can a person place 100 gram (strongest) ALUMINUM tin foil on or around the router and under the desk where laptop is placed to reduced emissions???

  • Lloyd Burrell said,

    Aluminum foil can be used to shield WiFi radiation……depending on the thickness of the foil and how you use it… careful about covering the router directly doing this could create a fire hazard.

  • Lloyd Burrell said,

    There is no easy way of dealing with this…..but I have written at length about smart meters and possible shielding solutions, see

  • Jean said,

    Just wanted to remind people who have turned the Wifi off on their routers to make sure that you have also turned off the wireless on your computer’s internet connection setting. I had once turned the wifi connection off in my router setup but had forgotten about the computer’s internet connection setup. My laptop continued to put out a 2.5 gigahertz blast at least once a minute even though I was online with a “wired” router setting.

  • Fausto said,

    Apple Time Capsule, using dual band 2.4Ghz and 5Ghz, emits very high levels of EMF. Much more than a normal 2.4Ghz router. I measured with Cornet ED78S meter.

  • Carolyn said,

    Hello Lloyd, Your excellent website, free downloads and eBook have been very helpful as I try to learn about EMFs. I used my EDS78S meter on my sister’s home recently. I still have difficulty interpreting what I’m seeing.

    1. The smart meter outside her home registered ~.08-1.0 v/m with no spikes. This was at 1:30am. I expected the readings to be higher (like mine). She has a tower as close to her home as mine. Why the lower readings?

    2. The readings on the telephone box (next to the smart meter box) were much higher…~1.0-3.8 v/m. Does the telephone box pose a problem?

    3. In her home, the readings from the modem/router are ~.08-2.0 v/m. To even hard wire her computer won’t eliminate the radio waves being emitting from the equipment. Changing out the equipment isn’t really an option (long story). Is there any alternative other than unplugging the equipment except when in use? What about a DIY heavy foil “box” that could be placed over the equipment (with opening in the back for air circulation)?

    4. Am I using the right measure: v/m?

  • Teri said,

    Need to know the difference between Net meter and Smart meter. I was told the net meter doesn’t release EMF but it was required (by xcel not the solar company) in order for me to get solar panels which I just put on hold until I get clarification.

  • nick pap said,


    About shipping.Are there any extra customs costs? I’m living in Greece.

  • nick pap said,


    My name is Nick Papadopoulos and live in Greece.I live in a village that had an increased amount of cancer patients lately .After some time we realized that there are some cell towers spread in the village hidden in roofs of some houses.Now there has been reaction from the citizens and the antennas are gone or we think they are gone.
    IS there any possibility one of these meters can measure EMF in work place and home? Also if we are suspicious about a hidden cell tower is there any machine that can make sound if we approach to an EMF source.I am looking Cornet ed78s.Does this fits in my case or should i look something else?

    Thanks in advance
    Best regards
    Nick Papadopoulos

  • Lloyd Burrell said,

    Hi Nick
    “Can this meter measure EMFs in the work place and home?” “EMFs in the work place and home” covers a broad spectrum of frequencies… one EMF meter can measure all of these….but this meter is a dual function meter it measures RF radiation (which is what cell towers emit) and magnetic fields…..its a good choice for a first meter.
    Re your second question on shipping costs – I don’t actually sell this meter but when you click on the link above the company selling the meter does offer free worldwide delivery.
    If you’ve not already done so you might want to subscribe to my Free Report to gain a better understanding of this issue.

  • Chris said,

    I’m new to the idea of checking for radiation. My wife and I are heavy users of electronics (computers, cell phones (iPhone 4s and HTC One), Apple Time capsule, Wi-FI, home network, iPads, bluetooth headset (a Parrot) and more). Could you recommend the best meter for us to use to check these devices? Also, can you give me an idea of what the maximum “safe” levels are over some time period (e.g., per year) as recommended by the most recent credible studies? Thanks so much!



  • Lloyd Burrell said,

    Whats the ‘best meter’?… depends on so many things……budget, what you want to measure, your own sensitivity, how technically minded you are….rest assured this is a very good meter for the price.
    Re your second question, whats safe, again no simple answer…..the BioInitiative report 2012 is a v good resource on this as is my Free Report.

  • Chris said,

    Thanks, Lloyd!

  • Steve Morrison said,

    Hi Lloyd,

    I want to measure my smart meter. I am told that I need an Acoustimeter because the sampling rate is so high. I would like to get the Cornet ED 78S if you think that will work for my smart meter. Thanks for your input.


  • Lloyd Burrell said,

    I’ve found the Acoustimeter to be slightly more sensitive than the ED78S…..but both of these meters are suitable for measuring smart meter radiation.

  • michael said,

    aaaand here i come to find you’re already done reviews of meters which can read the smart meter radiation and i can afford :l , don’t see how i could have found these pages , sigh a simple link reply could have saved me a lot of time , but i guess researching is always nice , just not when you’re hungry and being drenched in mf radiation from smart meters lol…..

  • Lloyd Burrell said,

    Hi Michael
    I have a huge backlog of messages to reply to……so sorry for not having replied sooner. So yes please refer to these pages to decide whats the best meter for you.

  • Megan said,

    Hello Lloyd,

    Thanks for your review.

    I live near a television tower, will the Cornet ED 78S adequately measure the radiation emitted from the tower?

    Thanks, and apologies if you have already covered this question elsewhere.

  • Lloyd Burrell said,

    It all depends on what frequency the TV emissions are broadcast at… should be OK with the ED78S (it measures down to 100MHz)…..if your budget will stretch to it the ED85EX would be a better choice… has a much broader frequency range than the ED 78S.

  • P4 said,

    Hi Lloyd thnx so much for all the info. Where is the company from to buy the ED78s from? How much more money is the ed85ey?
    I have to secretly turn off the wifi in my house. It’s caused a major confrontation with my husband and now he claims the internet is slower from the on off and often stops completely and he has to reboot often. Is my turning off at night causing this? Or is it all the on offing in general? As in having wifi on for 30 mins then turning off?
    What do you recommend to cover the router with and then not have to turn off at night?
    Thnx in advance.

  • Lloyd Burrell said,

    I don’t sell either of these meters. For price information see I don’t recommend covering the router – this can cause a fire hazard it is safer to switch it on and off…..the Netgear N150 has a built in switch so you can do this.

  • Andrew Silver said,

    Lloyd, would you know if there is there a WiFi router that can be programmed to automatically turn off WiFi during specific hours (e.g. nights) and also enables you the power output to be reduced to around 25mW or less? Currently I use a 2wire router supplied by AT&T which allows you to set power output between 400mW and 25mW and allows you to disable WiFi through the portal, but does not offer the ability to set a schedule for the WiFi. I can’t use an external timer to shut it off at night since the router also manages our wired telephone and alarm. Thank you – great site as always.

  • Lloyd Burrell said,

    Hi Andrew
    Sorry I don’t know of any router that has a programming feature – there’s clearly a need for this.

  • P4 said,

    Thnx does the on offing cause the connection to weaken which hubby claims?
    If I turn off mobile, iPad and wifi, my connection in the bedroom doesn’t give a signal or at the most one intermitently – is it still adviseable to turn off router at night. Trying to ease tensions with hubby.
    Does sleeping on a wrought iron bed have the same effect as sleeping on a satellite?

  • michael said,

    wireless functionality of a router has nothing to do with an isp’s connection speed

    no turning off a router for the night does not impact it’s performance , i turn off my router every night with no such effects , the problem would either lie in the isp’s connection , or the router itself being broken in some way……

  • E.CO said,

    After reading your advice on RF meters I began to investigate purchasing one. I was told by a company that sells RF meters and trains folks on how to use them that in all of their trials that this meter DOES NOT read smart meters! They suggested not to buy this meter .The cheapest one that could be accurately used was 400 dollars and is not in your list. What gives?

  • Lloyd Burrell said,

    If the Cornet ED78S couldn’t measure smart meter radiation I’d be the first person to warn people about this. Its always easy to criticize, there are other EMF meters which are more sensitive (Acoustimeter, Acousticom 2, ED85EX) but there are always other trade-offs, price, functionality…..

  • Aidan Thomas said,

    Any advice for neutralising ear ringing, humming noise,? Docs say it’s tinnitus but it changes strength and my emf meter is indicating this too, particularly bad at night and not necessarily when all else is quiet. I work all over the place and find it’s almost like I can hear these towers communicating, just ordered the ED78,tried pendants etc…

  • michael said,


    well what company was that? and who from it told you such? i emailed another website that was selling these meters and said the ed78 could read smart meters , just that others could read them better , but with the ed78 i have now (which had a line of the lcd display lose power for no reason , waiting on a response from the place it was purchased from) i’ve maxed out it’s signal strength reading capabilities – which is 1827 wats/m2 – on multiple smart meters now (and plenty of other devices as well of course)…..

  • E.Co said,

    I was given this information by the capital seller of this devices. They train people how to read EMF etc. Their website is
    They said the Coronette other devices in this price range simply do not work and that the cheapest available device that will work is called the hf35C at $408. I am feeling beyond confused by the conflicting information!

  • Lloyd Burrell said,

    I don’t know who told you that the Cornet ED78S isn’t suitable for measuring smart meter radiation but its not Radmeters…..I took the time to verify this with them and more to the point its not true. This is one of their best selling EMF meters for measuring smart meter radiation…..I suspect that this erroneous information was given to you by a misinformed or unscrupulous competitor. Here’s a video showing the Cornet ED25G (a more basic RF meter than the ED78S) measuring smart meter radiation in Australia

  • Steve said,

    Hi Lloyd,

    I have just received my ED78S meter after long and hard research to find out which meter would be the best for me to buy.

    The meter is great at doing what it is supposed to do, however, it appears to make me more sensitive than mobile phones???

    I was wondering if you had experience of this or if anyone else has given similar feedback. I am disappointed as it seems to be a great meter and just what I need, except if it makes me more sensitive kind of defeats the object of what I am using it for.

    If you have had similar feedback from people is there a meter which gives off less EMF’s and is more EHS friendly?

    Thank you for all of your good work around EMF’s your work has helped me tremendously with my EHS.

    Many thanks,


    ps your latest interview with Barbara Wren was fab, My wife trained with her and I have trained with my wife in Naturopathy. So there is a good link there, it was great to see you interviewing her.

    On a side note, I asked on the day of the interview to ask Barbara if she thought that EHS symptoms could be overcome?

    My wife said that her answer to that would be yes, that you can transcend them or heal them, and the second part to the question was –

    Is EHS a protection mechanism that helps the person to know if a place is not good for them? Just like an animals sixth sense.

    If that is the case then surely it is actually a good thing to have EHS and it could be that some of us are actually more sensitive to EMF’s so that we can warn others of the dangers. Just a thought.

    I would love to hear your feedback to these questions. Sorry if I have bombarded you and it is not the right place to ask but I am keen to know your point of view.

  • Lloyd Burrell said,

    Hi Steve
    RF meters like the Cornet have microwave detectors….which do just that ‘detect’…..there is no technology in there which is overtly offensive….unlike a cell phone for instance which emits pulsed digital radiation BUT I’m not discounting your reaction….we are subtle energy beings….
    I’ve heard of this kind of reaction before but its quite uncommon.
    Re your other Qs:
    – can EHS symptoms be overcome….yes they can
    – Is EHS a protection mechanism…..a resounding yes
    I’ll be dealing with these questions in more detail in the coming weeks
    BTW if you can’t use your Cornet, then if you’re still in the return period I suggest you ask for a refund.

  • Steve said,

    Hi Lloyd,

    Thank you for your reply, I am within the 28days so think I will ask for a refund, I am slightly disappointed because it seems like a great meter and just what I want.

    Could you confirm that the acousticom 2 would have similar or the same kind of microwave detector?

    Perhaps it will react differently with me than the cornet. I have noticed this with mobiles I can’t be near smasung but nokia aren’t so bad.

    Thanks agian for this valuable service Lloyd.

    And I look forward to hearing you deal with these questions in the coming weeks as they have been on my mind since I first started experiencing EHS.

    The bit I am confused about is that if the symptoms can be overcome totally, then doesn’t that mean that you wouldn’t have the protection mechanism any more?

    With gratitude,


  • John said,

    I recently purchased an ED78S. I’m surprised that the meter rarely detects RF above the green bars, despite living in a medium-size town with wifi in the house and a cell tower a few blocks away. The only time it will measure in the yellow is when it’s right next to a cell phone, wifi router, or a cordless DECT phone base. Is this typical? I’m concerned that my meter is not measuring accurately. Is there a way to check this? I have compared the EMF readings with my TriField and have observed that they are low. Could this be the case with the RF readings too?


  • Lloyd Burrell said,

    Hi John
    It’s possible that your new Cornet is faulty and needs re-calibrating….its impossible to say from what you’re describing. Contact the vendor….providing you’re still within the return period you shouldn’t have any problem getting a replacement.

  • Jean said,

    I had purchased a Cornet ED78S last year. I have a digital smart meter which uses house wiring to send it’s RF communication and currently does not have it’s transceiver for outside broadcast turned on. (BTW, a wired digital smart meter using the house wiring to communicate is not safer than a wireless meter! The wiring in home was not designed for communication signals and now gives off high amounts of dirty electricity which immediately made me ill and is known to be the cause of many illnesses.)

    At the electric meter the ED78S would turn red and indicate very high microwave levels, while a more sensitive HF35C analyzer did not indicate this.

    I contacted Cornet and was told to send in images from the back my Cornet. They said that some US produced Cornets had a problem misinterpreting a high magnetic field read into a high microwave read of mW/M2

    The meter was returned and Cornet provided me with a new one and reimbursed shipping costs (it took months, but they did come through) which now provides reads consistent with my other meters although it is not quite as sensitive as more expensive meters.

    Its magnetic field reads are consistent with my Trifield, so John you may have a faulty Cornet.

  • michael said,


    i recently had possession of 2 of these meters as i needed to return my initial meter cause of fault in the lcd screen , and i tested the meters being next to each other while having them on to see if they would would be able to pick up a reading on each other at all , and i found that neither of them did…..

    course it’s also important to keep in mind if the meter doesn’t pick it up doesn’t mean there is no emission , there’s level 1 part we’ll say is normal background emissions from the matter this planet is made of , and then there’s the 1 billion parts that these meters are designed to measure and tell us what devices are emitting them , so if something emits under whichever threshold , in this example case 1 billion parts , then it’s emissions would not be read by the meter and it would tell you there’s no emissions at all…..

    and while it’s still an electronic device which has a current which we would be in contact with when using it , i suspect with your case it’s a simple matter of the placebo effect in that once you can measurable see the radiation you’re being exposed to your brain begins to take it into account as a threat which before it was not able to do since we have no evolved any seances that can detect the presences of radio frequency radiation…..


    the device has a legend on the face of it which tells you what the level of light warning measures at , all you have to do to see if it’s measuring accurately is see if the screen display numbers coincide with the led light levels according to the chart on the front……

    also lloyd i believe i still have some comments that have yet to be shown on this or other blog posts…….

  • John said,

    @ Lloyd, Jean, and Michael
    Thank you for your replies.

    I can contact Cornet about the inconsistencies with the Trifield.

    To further clarify my earlier comment, it does look like the digital display and the LED lights are consistent. However, I guess I was surprised that the readings were not higher. Perhaps it’s due to a faulty meter, and perhaps it was my misunderstanding on what the levels would/should be. Having a wifi router in my house, and having other houses very nearby, I expected the RF radiation to be at a level that was more “concerning”. However, the background reading on the Cornet is 0.005 – 0.010 mW/m2 (about .02-.04 on the V/m scale)… from what I understand that’s just at or below the level of concern for the Bioinitive report. And my reading is taken where there’s a wifi router only 12 feet from where I’m taking the measurement. I have to be within about 1-2 feet from the router itself to get a reading over 1 mW/m2. It would be interesting to know what kinds of readings others get in a home environment.

  • michael said,


    i can confirm those reading levels to be consistent with reading’s i’ve done for my own wireless signals , in 1 small place i lived in recently that was like 10 by 25 feet in area size , and having the router in 1 end of the place and walking out the door on the other lead me to lose the signal entirely

    however as mentioned above that’s only the levels that the meter can detect at , ……….
    ……well i was gonna try and quote the bioinitiative report on what the normal background radiation levels for the planet were but i got a blue screen when looking at the doc and had a hell of a time for the rest of the day getting my com in working condition again , for whatever reason there was a problem , but i have herd form other presentations that showcase the report say it’s supposed to be somewhere around 0.000000000001 mw/2m or something like that

    meaning that whenever our meters detect any it is actually f****** dangerously high as f*** since the above mentioned number estimate is the only safe known level of radiation exposure by science

    now you also say that’s below the stated level for concern in the report , but i haven’t read it and don’t want to risk trying to open the file again lol , so i’ll have to take your word for it , although as i just mentioned above the info on the safety exposure levels i’ve herd about….

  • Al said,

    Hi Lloyd – great site and thank you for the detailed review of this meter. I purchased it and it works great!

    I was concerned about some antennas at the building across from mine and found that when I opened the windows, the RF reading was at a “high yellow” on the Cornet of around 7mW/m2. When I closed the window, it dropped down to 0.12mW/m2 and in the green zone. Does this mean that closing my window is shielding the RF signal sufficiently enough to be fairly safe?

    Thank you and keep up the great work!

  • Cameron said,

    Dear Lloyd,

    We would like to measure the radiation from nearby railway power lines, and are wondering which meter to choose. We are hesitating between:

    * one of the Trifield meters, which seem to be more sensitive but also more awkward to read – at least the 100 XE, although there are also digital models available

    * the Cornet ED78S, which seems more user-friendly – the rail authorities express emissions in Tesla, like the Cornet can do – but which does not measure electric fields or on three axes.

    With specific reference to rail power lines:

    Do we need an AC or DC meter?

    What should we be measuring – electric and magnetic fields? Or only magnetic fields?

    If magnetic only: is the Cornet sensitive enough for measurements from about 20 metres away (distance from building to lines)?

    Lastly: how significant is the ability to measure on 3 axes (Trifield) as opposed to 1 axis (Cornet)?

    Thank you for any advice.

    Best regards,
    Cameron Ross

  • Jean said,

    Measurements of both high frequency and magnetic fields are needed so that you can protect yourself. The CornetED78S measures both but is not real sensitive. But if you’re looking for a general idea of what’s going on it’s very useful.

    The TriField 100XE is an excellent tool for measuring magnetic fields – I know electrical engineers who rely on it. I’ve had no problem using it and I’m not the sharpest knife in the drawer. It can also be sent to Alpha Lab to be retrofitted to be able to measure below .2mG which is needed for ES.

    I personally like the Gigahertz Solutions high frequency meters for measuring wireless radiation. They’re very sensitive but expensive.

    After becoming sick from TWACS power line communication and a digital smart meter, the Trifield and Gigahertz solution HF35C along with information from websites such as this have helped me learn how to protect myself as much as possible.

  • Cecelia said,

    Hi Lloyd,

    I’m so impressed by your research and your desire to help others. I am experiencing unexplained medical symptoms that puzzle my doctors, and a blog I stumbled upon described the dangers of EMFs. I am interested in making my home safer whether or not devices and signals are causing my current health problems. I don’t know where to start. I’m concerned about both home appliances and WiFi/cell phone issues, and I see this product advertised on a site you link to: Cornet ED25G. It is supposed to be helpful in both areas of concern, but I don’t see a review from you and would value your opinion. I see how prolific are the comments and requests you receive, but if you have the time to reply, I’d be so appreciative.

    Thank you!

  • Lloyd Burrell said,

    Hi Cecelia
    The major drawback with the Cornet ED25G is it only measures up to 3Ghz (ED78S measures to 8Ghz)….there are devices that emit above 3Ghz (e.g. WiFi)….the ED25G cannot measure these frequencies.

  • Cecelia said,

    OK, thank you for your helpful feedback. I’ll look into obtaining one of the more sensitive Cornet models. Thank you again!

  • Joe Carraro said,

    My Cornet electrosmog meter just arrived. Unfortunately I had no idea instructions and readings were in terms that needed to be interpreted by someone with scientific/engineering background. I have no idea.
    I was able to connect antenna, battery and turn on with power button, but then the instructions left me behind and I cannot figure what numbers mean.

    For example; (excuse my layman terms) big numbers under dBm range from — 54.4 to –57.8, with a rouge –45.1 outside; little numbers below, range from .0152 to 0021 mW/m2. When I push top button, big number under mW/m2 ranges .0024 to .0045 and little number below is steady at 21.97 mW/m2. there is also graph at right. I think my eyesight is already affected by radiation. Numbers fluctuate wildly depending on which side of house I am on. This was unit recommended to me by someone on list since I had asked for a meter to measure radiation from cell tower. Also it was recommended that I get a blood test to measure radiation levels before and after exposure. Can someone tell me name of test. I had checked around and folks in NM didn’t know.
    Thanks for all your help. JOE

  • Lloyd Burrell said,

    Hi Joe
    There are several different versions of the Cornet meter on the market, if you’ve bought the ED78S then my video above gives a very simple explanation of how to use this meter.

  • Joe Carraro said,

    Hi Lloyd-
    They sent me the ED-85EXS with an external antenna. And I thought that was the one you recommended to measure cell towers and that is what I am referencing in my message above. Should I send it back for the ED78S model?
    I had figured out how to use it as I state in my message above thanks to your video but I have no idea what the numbers mean. Right now the dBm range is -48.2 to -54.4 and mW/m2 is .0030. What do these numbers mean. And if point at the cell tower how do tell if reading is dangerous. Help.

  • Lloyd Burrell said,

    For instructions on how to use the ED-85EXS see the video on this page:

  • Sunny K. said,

    Hi Lloyd,

    Thanks for this information. Your website is a definite wake up call…

    I live in the vicinity (500 meters -about 550 yards-) from a high voltage power plant(50Hz) with high voltage poles. also, recently a cell tower was installed less than than 300 meters away (about 330 yards).

    1- Would the ED78S allow me to evaluate appropriately the EMF in my apartment from these two sources (high voltage & Cell tower ) ?

    2- I read your reviews of the HF 35C, Acoustimeter, Trifield 100XE, and ME 3030B meters. putting aside price, am i better off buying a combination of these meters or is the ED78S enough ? I’m a bit confused as to what meter to buy.. if I’m not looking for a professional measuring , just an uncomplicated evaluation of the threat to be able to protect.

    Thanks for your input,

  • Lloyd Burrell said,

    Hi Sunny
    Low cost solution -you the buy Cornet ED78S, it will measure RF radiation & magnetic fields
    More complete solution – you buy Acoustimeter & Gigahertz ME 3030B, to measure RF radiation, magnetic & electric fields

  • Joe Carraro said,

    I know how to use the ED-85exes what I do not know is what the readings Mean. what levels ae considered high or dangerous. That’s all want to know. Your video was helpful for operation but not for analysis. could you please give me a number or level.
    Thanks JOE

  • Lloyd Burrell said,

    Hi Joe
    The Cornet meters have LED lights indicating ‘high’ (red) and ‘low’ (green) EMF readings….observing these LED’s will give you a ball park appreciation of your exposures BUT there is no scientific certainty about what’s safe… does not equal ‘safe’.

  • Richard Yeoh said,

    Hi Lloyd,

    Can you advice me if the Cornet ED78S or the Tenmars TM-190 EMF Meter can do a better job for detecting spy cams & smart phone frequencies.

    Thank you in advance.
    Richard Yeoh

  • jachan said,

    Will this meter measure both ionizing and non-ionizing radiation from a cell phone? Or just the kind they report with SAR?


  • Lloyd Burrell said,

    Cell phones emit non-ionizing radiation…..this meter measures non-ionizing radiation.

  • John Watt said,


    I’ve noticed a post asking about scheduling of the radio portion of a wireless router. I have a ASUS RT N16 which has the feature of flexible scheduling of the radio (wifi). ASUS also has other models that have that feature as do other manufacturers.

    I have suggested to many that they remove (unthread)one or all external antennas which attenuates the output power. Usually there remains sufficient power to serve the household (but house next door won’t see the signal now). Do so at your own risk!!! I have seen dozens removed for months without any problems but….. read the warranty and documentation carefully. Do so at your own risk!!!

    Personally, I don’t use the scheduler any longer as I have installed cabling to all locations as necessary in my home. RECOMMENDED.

    I think a good choice is plug the router’s power supply into a timer (not digital). This reduces the d.e. induced into the AC circuit, while sleeping for example.

    While I’m here, I’ll also mention that I have a timer on my fridge(magnetic emf through the kitchen wall into bedroom). The seven hours “off” while sleeping does not soften stuff in the freezer.

  • Vasanth said,

    Hello Lloyd ,

    Thank you for the great work . You are my Hero !

    Based on your earlier recommendation and review several months ago I purchased a CORNET ED85EXS meter which is still in good condition.

    Would you recommend that I update myself with and buy the newly released model CORNET ED78S ? I don’t mind the costs . Is there a big difference between the above mentioned two model ?

    What would be the plus/minus points , if I now switch over to Model ED78S?

    Thank you very much in anticipation

    Vasanth, Bangalore, India

  • Lloyd Burrell said,

    Hi Vasanth,
    The ED78S has (slightly) reduced RF meter functionality compared to the ED85EXS…..if you’ve already got the ED85EXs the only reason you would buy the ED78S would be to measure magnetic fields.

  • Shaney said,

    hi would just like to know if these machines work universally I am in the uk and are they suitable for a novice like myself. I have only recently stumbled on this info and am deeply concerned for my children who both have smart phones and spend untold hours on Xbox iPads and iPods plus I have a wi fi router in my home and I pick up my neighbours connection eek!

  • Lloyd Burrell said,

    Some EMF meters have different versions which are designed to be used in different countries (e.g. the Trifield meter) but the Cornet ED78S will work anywhere.

  • Monica said,

    Hello Llyod,

    PLEASE PLEASE RESPOND. I am so confused about 1 vs 3 axis meters. I can’t find any info about the pros and cons.
    Will 1 axis not be accurate? How do I measure with 1 axis to be accurate? Do I have to turn around to measure the EMF from all 4 corners to get the same measurement I would get from the 3 axis meter? Basically how do I get the 1 axis to give me accurate measurements? And is 3 axis better? What if I don’t point accurately in the EMF direction? If I am a few degrees off? Will I not get the correct reading? I would like to buy a meter soon and I am looking at Cornet ED78S but the 1 axis is something I don’t understand.

    THank you

  • Lloyd Burrell said,

    Hi Monica,
    If you want to understand how to calculate a more accurate reading with a 1 axis meter, see under tri-axial: but I really wouldn’t lose any sleep on this question. These are consumer meters the idea is that you switch on and point this is how 99% of people use them. Read carefully the user guide which comes with the meter – this explains to you how to use it. Also see my video above.

  • Gmc said,

    Hi Lloyd. your articles seem very helpful indeed re. EMF pollution at home. I wanted to ask about if there is capability of the meter devices to be specific, to distinguish sources, and if so, to suggest what kind of elements.

    Are these devices able to distinguish between RF wireless networks? For example, if I live in a city suburb, there will be my home Wifi frequency and probably another 1 to 8 Wifi frequencies detectable from neighbours (and public hotspots), depending on time of day or night. Can these devices somehow distinguish between the Wifi networks and give an idea from the device itself how many there are, or where they are coming from individually?

    Also, for example, if a portable network drops by, for example from a coach stopping in traffic outside the house for a while, could these devices give me any idea that a new, temporary RF network has come along?

    I ask the same about cellphones. Will the meter devices just indicate general cellphone activity, or, for example when visitors come with phones, can the devices suggest this reasonably in any way that would give an idea how many working cellphones have just turned up?

    Also – for example, if all the home residents’ cellphones are switched off, say there was a kind of alien (perhaps hackers’) RF mobile (cellphone, or even wifi) frequency going. Could the meter devices somehow tell me this, or at least give a fairly good suggestion? For example – with all the wireless phones off, can a device point to cellphone frequency presence, which may be distinguishable from cellphones of neighbours (detatched city residences but only 4 – 7 metres or so apart)?

  • Lloyd Burrell said,

    Hi Gmc
    It’s possible to differentiate different types of RF pollution by listening carefully to the audio but none of the meters I’ve tested can differentiate different sources of radiation on screen (visually) – you would need a frequency analyzer to do this.

  • becky said,

    Hi Lloyd,

    Thanks for making such a good website its really inspiring.

    I have found a house that I would love to buy but I am concerned because it is about 1KM away from a big Radio/TV satellite tower! My feeling is that this may be dangerous to my health but I don’t know wether the distance away from the tower is safe. Are there any guidelines for what is a distance from a tower given strength of electric signal? I’d like to make an informed decision about this!

    Thanks so much for your time!

    BEcky :)

  • michael said,

    there’s bound to be lots of graphs you could find by simply searching them that can tell you this , though for more practical decision making if you have an rf meter you’d be able to read the measurements yourself , for example im able to pick up the signal from the cell tower that’s above the nearby town a good 6km away if there’s a dirrect line of sight on my cornet which reads as low as .01 vm/2 , and from around 1km away still with a direct los i pick up around .1 vm/2 , however if i go into forest and try to measure from there the trees block the signal strong enough so that im not able to get a reading , which keep in mind doesn’t mean it’s safe just means that the device i have can’t detect it’s signal anymore……

  • Iivert said,

    Hi. I have Cornet ED78S electrosmog and I am a bit confused with the readings. It has two reading, the main value (peak) ja little A value.

    For example at first house it shows 0.1000 mW/m2 / A0.1000. This house is 100 meters from a basestation. You can see basestation/antenna from the window.
    And second house it shows 1 mW/m2 / 0.0005A. This house is 500 meters from a basestation. I don’t know if neighbours have wifirouters etc.

    Which could be considered safer? Thanks, I really need your help.

  • Lloyd Burrell said,

    Hi Livert
    It’s quite possible for RF readings to be lower where the base station is nearer compared to the readings in the house where the base station is further away – that’s precisely why you need to take readings. In your example house 1 has the lower readings.
    Make sure the display is set to mW/m2 and then read the big digits……I suggest you watch my video above carefully.

  • Paul Holm said,

    There are already independent researches about the radiation and how badly it affects every living mechanism, the problem is that only the telecom-industry initated and paid organisations like ICNIRP and most of the “radiation safety governments” in countries world wide is a cover up for the free road that exist for the telecom. There is a big need of getting rid of those illegal organisations and theirs members that lie hard and that sets the standard of radiation security levels. Independent research already exist and there are hundreds or maybe thousands of results that show good what happens and how lethal the radation is.

  • Joe said,

    Hi Lloyd,

    Than you for all of your reviews, it helped me out buy to ED 78s. Running great just have a question, when I put the sound option, my readings in mW/M2 increase singnifcanlty when testing the same source. Is this normal? It seems that the sound option would just be an addition, not increase sensitivity.


  • Vikas said,

    Long before I discovered your excellent site, I had bought a AM-10 acoustimeter (RF meter) It gives two read outs: 1, in microwatts/sq meter and 2, peak and averaged volts/meter. I know microW/sq meter indicates ambient RF. WHat does volts/m inidcate? Secondly what is safe level of ambient RF ?

  • Lloyd Burrell said,

    Hi Joe
    Using the sound function shouldn’t increase the reading on your meter…..if your meter is still under guarantee I suggest contacting the vendor to get the calibration on your meter checked. I recommend using the meter on the V/m setting……V/m gives a reading of peak signal strength which is more relevant to health see

  • Lloyd Burrell said,

    Hi Vikas
    V/m gives peak signal strength – for an explanation see the link I supplied in my previous comment.

    Science is unable to give us a ‘safe’ level or RF exposures…..the Bioinitiative report gives us a precautionary level

  • Monica said,

    Hello Lloyd,

    I bought the meter as per your suggestion and I can tell you that it works very well and is impressively accurate. A big thank you.

    As my main concern has always been on the LF side, I never worried or focused on the RF side. I don’t understand the RF side. I received a guideline from the company I bought the meter from, but it is giving me the info in (mu). μW/m2

    Example of the guideline.
    1000 Extreme Concern.

    This meter is in mW/m2. So it’s just a question of different symbols? μW/m2= mW/m2 (??????)

    Also I don’t understand the information on the meter
    ex. 40dBm 0.06 mW/m2

    Can you please explain?

    As always thank you so much.

  • Lloyd Burrell said,

    Hi Monica
    Whats important is obtaining readings that give you meaningful information….the danger is over simplification because this is a complex subject and there is no black & white….when it says “extreme concern” it’s an indication. This article should help you better understand the measurement units you need to use & what you’re trying to measure
    For measuring bio effects the best measurement unit is V/m – so I recommend using it on this setting.

  • Christine said,

    Hi Lloyd,
    I live in the UK and read on your website that the meters are calibrated for 50 Hz. I want to buy a Cornet. Do you know where to buy a 60 Hz ED78S? Is this still the best version?
    Thank you so much, I really appreciate your help.

  • Lloyd Burrell said,

    Hi Christine
    There is a version of the Trifield 100XE meter which is frequency dependent (50Hz/60Hz) but the Cornet ED78S can be used anywhere.

  • Bill said,

    Hi Lloyd,
    I am mostly concerned right now with radiation emitted from cell phone towers. Please forgive my ignorance, but when I read your reviews of the various meters, I get confused by some terminology: in the Cornet descriptions, it’s said that they read radiation from ‘cell phone towers (base stations)’; then for the Acoustimeter and Acousticom, the description says they’ll detect radiation from ‘cell towers (masts).’ Is this ‘base stations’ vs ‘masts’ a difference that I should be concerned with when choosing the appropriate meter to buy?
    Thank you for all of your valuable information.

  • William E said,

    Hello Lloyd,
    I keep reading that ‘most of the High-frequency electromagnetic radiation meters (both professional and simple) are not able to measure multiple frequencies and multiple radiation sources correctly,’ that they ‘will show only part of the RF level when measuring multi frequency sources, or several source at once (like most RF meters).’ Will this make it difficult for me to get accurate readings with my Cornet ED78S as to the radiation levels I am exposed to from a cell tower on the roof of my apartment building, because the tower will emit RF radiation in several frequencies?
    Thank you for any help in understanding this!

  • Lloyd Burrell said,

    Hi William
    This meter cannot distinguish between RF emissions from different sources (cell tower WiFi etc)….to do that you would need a spectrum analyzer BUT this meter has a broad frequency range (unlike many EMF meters on the market) and so is well suited to measuring radiation emissions from cell towers.

  • Bruce said,

    Hi Lloyd,
    I purchased a ED78s based on your review, primarily to test my old microwave oven and check cell phones. My old oven puts out around 40 mW/cm2 with the ED78s almost against the door. Figured maybe should use our induction cooktop more… I measured for EMF (about 6″ away) … in LF30 mode it’s off the graph. In LF600 it’s around 20 uT. Not sure which setting to use LF30 or LF600?

  • Lloyd Burrell said,

    Hi Bruce
    LF30 mode is the most sensitive setting for magnetic fields… but it only measures up to 10mG. On LF600 mode you’re getting readings of 20ut…which equates to 200mG….so you should be using the LF600 setting…..induction cookers can emit very high magnetic fields.

  • Adamo said,

    Hi Lloyd,

    I am new to this party and I just received my Trifield meter and looking for a good RF meter to pair with that. I am debating this one or the more expensive Acoustimeter RF Meter Model AM-10.

    What would be the main differences and yoru suggestion on which to purchase.

    Thank you,


  • Lloyd Burrell said,

    Hi Adamo
    The ED78S is a combo meter….it measures MF and RFR and so is a good starter meter.
    If you already have the Trifield the Acoustimeter is the better choice for you.

  • Adamo said,

    Thank you Lloyd,

    I guess a better comparison would have been between the Acoustimeter and the Gigabyte Solutions 35C.

    It seems they are often compared against each other, on these forums included think it will be the Acoustimeter for me.


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