Cornet ED78S EMF Meter – My Review

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?

The Cornet ED78S has been replaced by the Cornet ED88T, see my review here.

This article was last updated January 2018.

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  • 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?

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