EMF Meter,Advanced GQ EMF-390 Multi-Field Electromagnetic Radiation 3-in-1 EMF ELF RF meter, 5G Cell Tower Smart meter Wifi Signal Detector RF up to 10GHz with Data Logger and 2.5Ghz Spectrum Analyzer

Defective Meter/Horrible Experience
You may receive a functional meter from GQ Electronics. But, this is by no means guaranteed, and good luck getting your problem resolved if you get one of their bad ones!As a Senior Computer/Electronics Design Verification Engineer now working as an EMF Consultant, I know well how to determine if electronic hardware is defective in general (and EMF meters in specific), and the GQ-EMF 390 I received is clearly defective (details below and in the attached pics). For the same reason, it’s also obvious to me when a manufacturer’s Quality Control and Debug processes are broken: In this case, GQ Electronics allowed a defective meter to be shipped out not once but twice, they have repeatedly failed to properly identify/debug/fix the problem, and they’re *still* wasting my time and energy with ridiculous, condescending and redundant run-arounds, instead of owning the problem and replacing the broken meter. Ego? Incompetence? Both?)As you can see from the attached photos (also sent to GQ Electronics), for example, the meter I received shows an RF reading of 0 mW/m2, in both “RF Browser” and “All-in-one” modes, even when placed right next to two transmitting RF sources (cordless phone handset and base station). For reference, you can see my known-good Cornet meter in the same pics, set to the same units, showing the proper RF readings. One would think this would be enough verification for them to recognize the problem and take responsibility for doing right by their customer who’s debugged and verified the problem for them. But, amazingly, no….When I sent the broken meter back to them, they called it “user error” because the meter happened to be in the mW/cm2 units (which I tried as a last resort when it only ever read 0 RF in mW/m2). As I’ve told them repeatedly, the meter has never registered an RF signal – it reads 0 RF in all RF-detecting modes, orientations, and units, even when right next to any type of RF radiation (cordless phones, wifi, mobile phones). But, they just ignored me and gave me a condescending lesson on the difference between the units settings (mW/m2 vs. mW/cm2) and sent the defective meter back to me, without even testing it (obviously).Now, even after viewing the photos, they’ve denied my second request to return the still-defective meter..instead giving me the run-around…saying that because of the location of the sensor, I should try different orienting the meter in different ways. Not only, as I’ve told them multiple times, does the meter read 0 RF in any orientation/units, but if one of their “working” meters cannot accurately detect an RF signal right next to TWO TRANSMITTING RF SOURCES (cordless base station and handset – see pics), then it’s useless: Ie, if this is how one of their “working” meters functions, then your health is very much at risk if you rely on the GQ-EMF 390. But, I think the meter’s truly defective, they just won’t admit it, and this is just one more ridiculous and redundant run-around, wasting more of my time and energy, avoiding the problem, and leaving me with a meter that’s useless for RF Radiation.Speaking of more ridiculous and redundant run-arounds: The first thing I asked on the phone when I called in originally and was told I needed to return the meter was, “Are there any possible firmware fixes I could try before sending it back?” Joseph told me, “No, it’s a hardware problem, you need to return it.”So, now, they’re asking me for the serial # and firmware revision #…saying maybe it needs a firmware update. First of all, this was already checked (by my request before) I originally returned the meter. Second of all, don’t they check this before sending out a meter in the first place…and, especially, when a meter’s been returned?! (Again: Broken Debugging methodology, as well as broken Quality Control practices…not to mention the breach of ethics and professionalism.)So, you can expect nothing but headaches and unnecessary, unscrupulous, buck-passing run-arounds from GQ Electronics if you get one of their defective meters. They won’t do the right thing by you by owning and fixing the problem. Instead, they’ll blame you for it and waste your time and energy in avoidance tactics. I wish I’d never ordered it, and hope to make others aware of the risks of a similar experience if you order one of their meters.My experience doing business with GQ Electronics has left me angry, fed up, and very unsatisfied — Beware!

Good meter – but you gotta learn to sweet talk to it.
I just got my GQ EMF-390 meter and have spent a number of hours playing with it and testing it. I like it, and it’s a good meter, but you gotta learn to sweet talk to it. In other words, you have to invest some time in learning how to use it properly.I am in training with the Building Biology Institute to become an Electromagnetic Radiation Specialist. I’m speaking for me, not for them though. But, I mention it because I’ve spent a lot of time studying EMF meters and EMF measurements lately. That point of view affects how I view these instruments.Consider this an introduction to a review, as I just realized I’m running out of time and have to continue later. So, for the moment, I’ll just post some high points.01) This is a consumer grade instrument, which they say in the FAQ, not professional grade. So, balance your expectations accordingly. However, that doesn’t mean it can’t be useful to a professional, as well as consumers.02) The quick start guide is just that. Do read it. But realize that’s only the beginning of your journey. Download the full user guide, which is a PDF of many pages, and go through that. At least their documents are written in mostly good English, as opposed to Chinese-English. As a bonus, the quick start guide is in color.03) Learn how to operate the controls. This may not be obvious at first. Once you’re used to them, it will seem much more natural. While the buttons don’t have printed labels on them, they do have shapes molded into the plastic, which you can see if you look.Some buttons do different things depending on whether you press and release, or press and hold.If you have the meter facing you, in landscape (wide) mode, and the buttons and model number are on the right:The TOP button, which they call S4, can: check the battery when powered off, power the unit on and off, activate the menu system when powered on, select items in the menu system, and sometimes change things in the menu system.The BOTTOM button, which they call S1, can: back you out of most menus, activate a menu to select the different screens of the device.So, an effective technique to go through menu settings is: press the TOP S4 button to get into the menu, press one of the middle buttons to navigate, press the TOP S4 to select an option, press the middle buttons to change an option, press the TOP S4 button to finalize your answer. Sometimes, pressing S4 will change an answer, so make sure the screen says what you want when you’re done. You can then get out of the menu system with the BOTTOM S1 button. You can, if you wish, go back into the menu, and examine each setting without changing it to verify the settings.When not in a menu, the middle S2 and S3 buttons do various things, like allowing you to alter units, switching from EMF (magnetic and electric field) mode, to RF (radio field mode), moving a cursor, zooming in or out, etc. You kind of have to play with these buttons on each screen. Sometimes they do something different if you hold them down.04) IMPORTANT, learn how to point the meter. Inexpensive meters have sensors which are directional, and they care about how they’re oriented in space. This meter has a 3 axis magnetic field sensor, which they label on the screen as EMF. So, you can turn the meter any way you want to read magnetic fields. BUT, the electric field sensor (EF), and the radio field sensor (RF) are directional. If you’re pointing the meter the wrong way, you may get wrong readings, or no readings.This is documented on page 5 of the quick start guide, as well as in the PDF. Nevertheless, it bit me and caused me to lose some sleep last night fretting with it. I haven’t done much with the EF sensor, but I’ve been working with RF. This meter may NOT work like you expect, but it will work if you treat it right. My Safe and Sound Pro II meter and my Cornet ED88TPlus will both respond to most RF signals if you are holding the meter in front of you in portrait mode (vertically), with the display facing you, and the RF source, like a cell tower, out in front of you. This meter will NOT respond that way. With this meter, you would be pointing it’s sensor up into the sky.Imagine this meter is a small airplane. Place the meter flat on a table with the buttons and label near you and the display face up. The near end with the buttons is the tail. The far end where the propeller of a plane would be (its nose) is the front. The far end, as in edge, of the meter is where the RF sensor is pointing. If there were a cell tower, for example, out in front of your table, you could get a reading on it. In terms of an airplane, pitch means to bring the nose up or down. Yaw means to slide the tail left or right, turning without changing the bank of the wings. And roll means to bank or tilt the wings left or right. Rolling left or right is (sort of) what a race car does going around a sharp turn on a banked track.For lack of better terms to use, this meter CARES about pitch, roll, and yaw. If you pitch the nose of the meter up or down substantially off the line to the source, you will get bad or no readings. If you yaw the meter left or right substantially off the line to the source, you will get bad or no readings. But, that’s not all. The meter cares about roll too.All radio waves move outward from the source. But they also have orientation in space. They may be oriented vertically as they move outward. This is called vertical polarization. This usually requires a vertically oriented antenna to receive well. They may be oriented horizontally as they move outward. This is less common and is called horizontal polarization. This usually requires a horizontally oriented antenna to receive well. There are even some sources which are circularly polarized.If you have a cordless phone, you could test your meter with it. At least in the US, almost all cordless phone base stations radiate a strong signal all the time. One you should not stay around. Remember that verbiage on the box that says it will work 900 m away? But you don’t sit 900 m away do you? I have decommissioned all my cordless phones. But, they make a great little personal microwave beacon for testing. Just plug in the cordless phone base station to a power source, set it several feet away, and start taking readings. It should put out a continuous signal. On meters with a histogram mode or moving graph mode, like the GQ EMF-390 or the Cornet ED88TPlus, you should see a continuous signal or a continuous string of pulses. You can also test the meter pointing it at a cell tower, etc.So, what this all this means is, assume you have pointed the meter up and down (pitch) to line up with the source, and you have pointed the meter left to right (yaw) to line up with the source, and it’s lying flat on the table (or in your hand) with the display up (roll), you STILL may not get a good reading. This was my experience testing with the cordless phone base station. I had to roll the meter 90 degrees, so the display was facing to my left. THEN, I got a strong and consistent reading.You may have to do similar gymnastics with the Cornet ED88TPlus and other meters. This is true with any meter with single axis sensors. This may make the display hard to read because it’s facing away from you. The difference between this meter and the Safe and Sound Pro II and the Cornet ED88TPlus is that those measure RF with the display facing you as you might expect, and this one doesn’t.That’s it for now. I hope to add more later. This should get you started. Forgive any typos as I was in a hurry.Bottom line, this seems to be a good meter if you understand its limitations and treat it properly. If you treat it wrongly, it will give you bad readings in return.Hope it helps.Ron

This meter is half the price of equivalent competitors and provides everything a budding home worker or concerned parent could possibly need. Easy to use and sensitive enough to be able to easily sense check that the meter readings are reliable (which they are with mine). Super accurate in fact, especially when held correctly (as shown in small printed instructions). I wanted it to check my home office and particularly the electric / electromagnetic field fields and radio frequencies (aka WiFi exposure) at my desk & kitchen table (for home working under lock down). With some small changes was able to reduce our exposure to all forms of invisible radiation by more than 10 times. Also was able to see change in RF in real time as I used WiFi on my iPad. I already knew that you should not hold your iPad in your hands and use WiFi but the results were an eye opener. Needless to say my desktop computer is not connected by Ethernet cable and favoured (whenever possible) over the iPad. I have also move the modem (which is really harmful at short range, shit these things should come with a serious health warning!) as far from me as possible. This device is a God send and only after I had bought this meter did I watch ‘Better Call Saul’. So glad I went for this meter and would recommend to anyone remotely concerned about their health with all the debate raging over 5G

Very good instrument and very fast and accurate delivery.