GQ GMC-500+ (Plus) Geiger Counter Nuclear Radiation Detector Monitor Beta Gamma X-Ray Dosimeter

I bought this partly out of scientific curiosity (I'm a geologist) and its probably one of those essentials in these uncertain times. Where I live has a very long history of mineralisation and extraction (Devon/Cornwall UK) and I often go out on and around the moors picking up rocks and the like that look interesting (to my eye!) and so I do like to check for radiation particularly as Uranium and Radium does exist here and there. It was mined not far from me until the 1930s and I would love to find some minerals (probably NOT one of the smartest ideas I've had). Anyway this little device fits the bill perfectly, it measures Gamma and Beta radiation using two Geiger Muller tubes. It does not detect Alpha probably because the glass surrounding the tubes would block it, you've also got to be really close, like millimetres from an Alpha source to ge a reading. Its very easy to use and has a host of functions for displaying the live and historical count. The batteries which are USB rechargeable seem to last an age as well. The unit comes with its own soft carry case that fits on your belt as well as a useful credit card radiation hazard guide. The unit is a little bit smaller than your average smartphone. Although its probably not suitable for the job I do like to scan around the house occasionally. Our house has 3 ft thick granite walls in places and is susceptible to Radon build up. We do have a Radon extraction unit working 24/7 in case you're wondering. Radon itself is an Alpha emitter so the unit is not much good for that but Radon does rapidly decay in to daughter Isoptopes some of which are detectible via Beta radiation. Its currently clicking away on my desk at an average of 22 counts per min or 1.7 uSv/hour if you prefer which is normal and ok. So yes its a really worthwhile purchase if you're interested in Radiation in the environment or just plain curious.

Measuring Radiation is complicated to understand, at least for me. All I want to know is if the levels are safe or not. This very well thought out & uncomplicated product tells you exactly that. Short press of power button illuminates the screen while showing the power remaining in the replaceable battery. Long press turns it on. Charging is via supplied usb cable but no plug supplied, im using a usb mains charger plug that charges my phone. The screen rotates as you turn it so it can be set on its side or bottom. The backlit screen is dimmable with time out, brightness and contrast & you can set the screen to off or constant on. If the screen times out (depending on settings) then moving the detector will make the back light come on. The display is nice and easy to read with black font against what looks to me like a very pale blue white light. Its not too cluttered with info either. Its also a dose meter & has a food setting. Dont know how long the battery lasts but I have used it with the back light on for around 5 hours and its still got 80% left. It clicks and a green light flashes, you can turn these off, im really impressed with this, its so well thought out. I also bought the GQ EMF-390 for measuring Electro Magnetic Fields. Same design and user interface & screen as the Radiation meter, meaning you dont have to learn 2 devices. Fantastic products which l highly recommend & I think are a good price too.

This Geiger counter is probably the best value on the market right now. You'll easily pay double for an uncalibrated Soviet model from the seventies, or three times the amount I paid for this model for a US-made CDV-700 or similar. What I'm saying is - this is very good value. This Geiger counter has some features that I really like, namely: 1. The ability to charge it over USB. Instead of faffing around with D-cells or hunting for AA batteries from TV remotes, it uses an internal Lithium-Ion battery that charges over the USB port. I haven't run the battery down yet, but I have been using it on and off and the battery has stayed pretty constant. I have no doubt that it'll last a good amount of time, especially if being used with a laptop or computer. 2. The dual tubes. Instead of using a single Geiger-Muller tube, it uses two. This means that it can detect low-level radiation with a good amount of accuracy, as well as being able to detect higher levels of radiation that you'd probably hope to never encounter. This counter reads the check source from my CDV-700 brilliantly, showing roughly 1150 counts-per-minute. It's decently accurate, especially for the price - though don't expect 100% accurate Alpha emitter measurements, this is strictly a beta and gamma unit - though it lacks a Beta shield, so you'll have to come up with your own material to block gamma rays for purely gamma measuring. 3. Data logging over USB. This was a big draw for me - the ability to plug it in to my laptop over USB and have live reporting to a CSV database is outstanding. I can display the current level of radiation on a graph, right on my laptop display, without hassle. You can also sync it up to a live world map and let other people view the radiation in your area if you like - though you don't have to. A star is knocked off here because the WiFi connectivity is a pain to set up, and logging over WiFi was equally confusing. Not a massive dealbreaker, but be aware. There is a great forum run by users of this counter and other GQ products, so asking there is a good bet if you get stuck. 4. Display clarity - the display on this device is outstanding. The days of having to guess where the needle is sitting on an analog geiger counter, or fumble with an LCD display that disappears in dim light are gone. The display is fully backlit, and you can set it to display measurements in a numbers only format, or on a graph. It refreshes enough to get nice accurate results, and this combined with the classic click-click-click of the counter makes this a very fun, tactile unit to use. 5. Portability - this item is absolutely -perfect- for taking out and about. It includes a nice durable pouch with a belt clip, and the unit is only really the size of one of those Casio calculators that many of us used in our GCSEs. It weighs next to nothing, but don't let that fool you into thinking it's flimsy - it's durable enough to be used out in the field, though I'd probably not drop it or abuse it as much as I might with, say, a CDV-700 or similar military/civil defence unit. The speakers are built in, and a 3.5mm jack allows the usage of headphones with the unit - no hassle, no fuss, no carting around a speaker. Overall, if you're looking for a Geiger counter to monitor radiation levels around where you live, hunt for radioactive rocks, test radioactive watches or military dials, or see why the mysterious object the cat dragged in is glowing, this is a perfect item for you. I just can't believe it's as cheap as it is!

Very good experience with the seller. Products just as described, no problems at all. Great costumer service, they wrote to me with an extra question about color, very respectful, helpful, excellent English. Fast delivery. Perfect transaction, thank you very much 😊

I’m very impressed with the GQ GMC-500+ Geiger Counter. It works exactly as described and measures radiation levels with excellent accuracy. Now I finally understand the real background radiation level around me, and it’s surprising how easy it is to use — just turn it on and it starts monitoring instantly. I especially like that I can compare my readings with radiation maps from other locations, where people use the same model. This gives a much clearer picture of what’s going on not only around my home but also in other regions. The device feels solid, the screen is bright, the data logging is very helpful, and the battery lasts a long time. If you want a reliable radiation detector that actually shows real numbers — this is the one. Highly recommended!

Respect EU and FR charts conformity for the electronics materials and components 🤗 The system works really well! Fast delivery from uk to FR in under 24h times Thx to GQ Electronics LLC, your geiger device was great and work well

I like it, Specifically for the Battery is removable

If you want a peace of mind you can't go wrong with this Geiger counter. I am very satisfied with the results. Get yourself one. It's worth the price you pay for it. I recommend you get a small case with foam in it for storage when not in use and to protect it from getting damaged.