Nuclear Radiation Detector GQ GMC-800 Geiger Counter USA Design Product US National Standard Large Color LCD Display 5 Alarm Types Dosimeter Data Save & Global Share Beta Gamma X-ray Portable Device

A very affordable and well made item with a large, colorful display that is easy to read and with pages and pages of different displays allowing you to customize what you want to see and how you want to see it. This is a "smart" device that can link to your PC and through the cable, the battery is kept charged for two or three days of field surveys. More if you turn it off between uses. I bought this just for the fun of detecting uranium in the Chinle and Morrison geologic formations of the Colorado Plateau and seeing for myself that genuine dinosaur bones and petrified wood from those formations can be quite radioactive. As mentioned, I bought this just for fun and not for any practical, safety or economic reasons. Unfortunately I have not had an opportunity to use the device for its intended purpose, but I have confirmed that the unit is functioning well. It sure would be nice to have a counter that displayed actual EVs of the radiation so that I could tell just what radioactive elements are present, but they cost more and for me, it just for a whim more than anything else. When visiting dinosaur museums, I'll turn off all alarms and sounds so as not to panic the public if a bone proves to be a bit "spicy" and I recommend others do so too.

Although the item is lightweight, the materials that were chosen seem to be sturdy enough to survive the everyday handling that it undergoes. Even when the levels of illumination are low, the huge color LCD display is bright and simple to see. When I utilized this device in a low-light condition, I must say that the screen functioned quite well, providing me with clear readings without causing my eyes to strain. You can easily move between the various alarms and settings because of the menu's user-friendly interface, which has navigation buttons that react quickly. I discovered that its measurements were very accurate, with only tiny discrepancies, when compared to the readings of other professional equipment that I have in my laboratory. When I am monitoring ambient levels or testing particular things for contamination, it is comforting to know that it has the capability to deliver dependable results. Depending on the location in which I am working, the five various forms of alarms—sound, vibration, light, data recording, and email notification—provide me with a variety of alternatives to tailor the manner in which I get alerts. This is really helpful.

I knew I wanted a dosimeter, and this one seemed like a good value. After running around my house checking for anything more radioactive than normal background levels, I’m happy to report I didn’t find anything alarming. Yay. The buttons are straightforward and the navigation is intuitive, though the measurements and terminology do take a bit of Googling at first to really understand what the device is telling you. The unit is surprisingly light. It doesn’t feel like it would take much of a beating, so if you plan to toss it in a bag, you’ll want to be a little careful. A silicone case would go a long way toward protecting it from everyday bumps. I haven’t looked yet, but I’d be surprised if someone doesn’t make one. Size-wise, it’s about like a deck of cards, maybe a bit larger, but you get the idea.

If you need a Geiger Counter and a Dosimeter, this detector is for you. I have years of experience working in PWR and BWR nuclear plants during outage inspections. The radiation surveys performed by Radiation Protection Specialists were completed by using Geiger Counters and paper smear tests. Early models of Geiger Counters were bulky, and dosimeters looked like a thick pen. Then, digital models of dosimeters similar to pagers were the new standard. This unit is the best of both worlds. It displays multiple screen pages of various information in color. It has a speaker to hear the hit counts, and it works fine in quieter areas. I would prefer to have a little more volume to increase the sound while working in noisy environments. Battery life is good. The rechargeable battery lasts between 3 and 4 days when the unit is left on while using the CPM dosimeter function. It comes with a soft case, but I recommend purchasing a hard case to provide additional protection for the detector. A credit card-sized Radiation Safety Guide, charging cord, carabiner, and instructions are included. It’s a nice piece of equipment for the money.

I bought this after my cat was treated with radioactive iodine for a thyroid tumor. The cat had to stay at the vet clinic for 3 days before her radioactivity level was low enough to come home but even then she had to be kept isolated for 2 weeks without me spending more than 10 minutes a couple of times a day within 6 feet of her. I also had to put her litter waste into a bucket for disposal for those 2 weeks. This device came in really handy as it allowed me to see exactly what radiation level the cat was giving off and see how it dropped off the farther away from her I got. This allowed me to feel more comfortable spending more time in the room with her during the second week. It was surprising to see how much the radioactivity level climbed when I put the device right next to her neck/thyroid area vs further down her body or when she was even a few inches away from the device. This also provided a way to check the radioactivity level of the waste buckets before putting them in the trash. The one from the first week was kept isolated for an additional week to allow more time for the radiation level to reduce before disposing of it. It was good to check the area of the room the cat likes to sleep in and see that there was no residual level of radiation showing when the cat was finally let out of the room. I was still reading some lower levels of radiation from the cat when I put the device right by her neck/thyroid area. I liked the ability to switch between the different measurement units on this device and the ability to silence the noise level while still seeing a clear LED display of green/yellow/red blink at the top as it detected radiation levels. The specific measurements were easy to read on the screen. I used this device for 20 to 90 minutes a day for the first couple of weeks of owning it and the battery level is still over 80% on the original charge.

I bought this as a verification for finding authentic uranium glass and it works like a charm! I love that it's rechargeable but I can also easily replace the rechargeable battery. It's a good size for taking with me when trying to find UV glass as it's about the size of a cell phone and fits in my pocket easily. The screen is clear, it's audible but not too loud, it has lots of options (especially love the dark mode!) and only takes a minute to read the cpm of any given glas piece! Super easy to use. Highly recommend as an affordable option for us uranium hunters!

Works as advertised. Used to check vintage watches for radioactive lumber, and does a good job for that purpose.

This is a great product. Easy to use and understand. Lightweight and handy carrying case. Multiple ways to read radation levels. Keeps a log of units perday. Rechargeable internal battery with a USB-C cable. I ordered this because I live close to a nuclear power plant and wanted to monitor levels. I also do a lot of hiking in Southern Utah and this is another tool when encountering old uranium mines. Definitely worth the money and best of all it's made in America.