GQ GMC-300S Digital Nuclear Radiation Detector Monitor Meter Geiger Counter Radiation Dosimeter

Exactly as described and well worth the price. I've tested this against some known elements in my collection and the counter works well. The interface is intuitive and easy to navigate to change various settings and customize the display. I chose this as an economical option that would still allow me to have audible and visual queues. The ability to view the data (including as a graph) and export it is appreciated, as is having a quick tool for the standard conversions and equivalent metrics of Sieverts, Rads, CPM and dose etc. Would also note the battery came charged and has held up well for hours now. I look forward to taking this on my upcoming trips to the odd mineral shop or planned conventions. Don't look at other cheaper options on Amazon from xyz brands and vendors... This product has the quality you are really looking for.

Seems to work great. Hope I never have to use it for real.

I've worked in a facility that handles waste products that all have some level of radioactive contamination, so I am well familiar with Geiger counters. It appears to work well with a degree of accuracy. The manual is easy to understand and the functionality of the instrument and basic setup was straightforward. I like the fact that it has a built-in rechargeable battery, and a full charge will give several hours of operation. Hopefully, I will never absolutely need to use it, but in these times it was quite inexpensive and offers much mental comfort.

It works as expected. I was shocked that the tube was not the M4011 tube. I'm not sure about the accuracy at this point. The insides seem well made. I didn't see anything that made me concerned about quality. The battery is a 800mh 14500. I wish it was bigger, but I'll have to play with it some to see how long the battery will last. The buttons are very tactile and the screen is simple and easy to read. The menu system take a little to get use to but not bad. In the end, it's a cheap geiger counter that does work and seem fairly well made. Things I wish were different: 1) a standard battery like 2 AA or larger capacity battery like a 18650 lithium. 2) an SBM-20 tube which is more sensitive. 3) a better more thought out gui/menu system. Honestly, I got this on a flash sale and it was very cheap. I can't really complain. It works enough to say this item is radioactive, which is exactly why I bought it. I really don't need to know the real accurate level of radiation. I just want to know what to stay away from in the event of an emergency. If you bought this, I would suggest that you buy some 14500 batteries and a battery charger to keep spare charged batteries available. Remember 3.7 volts 14500 battery.

Kid asked for spicy rocks (autunite and trinitite), which I found through a geology collector’s/Geiger checker website. And he asked for a Geiger counter/dosimeter — and this thing really works. It went off near the smoke detector (americium) and then we held it up to the autunite still in the glass bottle and then again in the collector’s metal tin, and there was a noticeable difference. Definitely works, but now I’m worried that my kiddo is just going to leave his unrefined uranium ore lying out and poison us all. 😂

Easy to use and figure out, beeps at you when it detects spicy particles, absolutely worth the cost as an entry level counter, small, handy, and the LCD screen is easily readable. Excellent battery life.

This is a good device and easy to use. Purchased for medical use. I think it’s worth the price. Looks really cool and easy to pack in a purse or back pack. Comes with a little card with the information on levels of radiation. It was in stock And arrived the next day.

I got this to monitor the radiation during and after my RAI therapy. For the most part, it seems accurate. The first 24 hrs of my RAI, the radiation from my neck area was off the charts. It was interesting to see but also scary. I used it as a way to determine the distance to keep myself far enough during isolation. As the radiation decays, the distance you radiate becomes less too. I also used it to monitor the radiation from my pillow. I have a favorite pillow and the neck area was still high in radiation. It took about a month and a half for the radiation to come back down to normal levels. Even the pillow cover was still high in radiation too. Having this tool really helped ease my worries about radiation and affecting those around me. It was well worth it. Hopefully I don't have to go thru that again. For those that do go thru something like RAI, this tool is helpful and I wish you a speedy recovery.