GQ GMC-300E-Plus Digital Geiger Counter Nulcear Radiation Detector Monitor Meter dosimeter Beta Gamma X ray Data Logger Recorder Realtime Monitoring Test Equipment

It works great tested it on my fire alarm they admit small amounts of radiation

It seems to mostly measure Gamma. So its readings are low. Otherwise it's great geiger counter for the money.

unfortunately, this little device does not distinguis, alpha, beta, gamma, or xrays. but for looking at overall chahges and rise in level of total counts over time, and sounding an alarm" it is perfect, the instructions are a little bit in Engrish but not too bad. overall, met expectations 100%

I bought this to check the amount of activity that my collection of old U glass emits. I also use it to check the distance, that each piece emits.I wanted to make sure I am not putting myself in harms way with this antique Yellow glass and Green glass.It will also ensure that any more purchased items of this type, are actually what they are described as.I also have been using it to play and check all sorts of things for radioactivity. The amount of detonations of Nukes since mid last century is staggering. The British even let off a few on mainland Australia in the 1960's, and also the French in the Pacific in the 1980's.I understand this is not a toy by any means, but it's my latest toy !No Issues with this item. Thank you.

Plug and play device.

not worth it!!!The device itself seems good qualify but browsing though the features I noticed a calibration feature. Why was this not disclosed in the product description? Secondly; how do you calibrate the device? Obviously with a known radiation source but considering radioactive decay is random in nature how can I be assured my sample is outputting the correct CPM to calibrate this device? You don't. It will calibrate it incorrectly. ** I believe the above point is clearly evident when I tried to test my Thoriatied TIG welding rods to see if it works. Now I don't doubt it was slightly radioactive on this device; but it was so rapid and the Red LED and alarm went off alerting me to a dangerous source. Now I know for a fact that many professionals like myself use Thoriatied welding rods all the time and the risk from radiation poisoning is minimal [if it was not every welder would be dead or have severe cancer for using it everyday.] Also be aware of the pricing!!! I got railed for buying it at the wrong time and notifying the seller of this only gave me a partial refund. He did NOT price match it where it should be. That alone makes it not worth it! Even If you can look past that the insane inaccuracies of this device it's not worth it. Even if it costs more, the one where you hold the box and point the 'microphone' to the source is worth it. This device it NOT.

Seems to work good but hope i never need it

Everything about this device is great, except I found it especially odd that there was no paper/printed user manual. I mean, how many people buy these with the expectation that the internet will be working when they need it? It would have also been nice to be able to use a USB-C or other common charger, rather than the more unique one required. Otherwise a great product.