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

I wanted a Geiger counter to measure my radiation levels after my PET scan. Sure enough this thing really worked! Stupid easy to use. Just hold down the power button. It’s the one furthest to the right, and it turns on and starts working right away. You can cycle measurement method by pressing the arrow buttons. It can measure in counts per minute (CPM), microsieverts per hour (μSv/h), or milliRoentgen per hour (mR/h). I tested it after my PET Scan and sure enough, I was radioactive!

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.

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.

Not sure why companies just put such low effort into their descriptions but no where does it say why kind of battery this uses. When I received it I noticed its a special 14500 lithium cell. Its AA sized but I tried a regular AA and it will not work. It needs the higher voltage of the 14500 battery. I do really like that at least the battery is removable. That is important for long term storage so there is not parasitic power drain as most devices have. I think if we;re using a 14500 why not just use an 18650 and that would at least be something more common for preppers and much monger battery life. If using AA sized batteries like a 14500 it should be compatible with 1.5V common AA at least but its not! The GMC-300S itself is really nice, I like the display and user interface, the options for display backlight levels and timeout, speaker LED indication ON/OFF, alarm threshold and many other options are great to set up how you want. Overall happy with this unit for the price. I will begrudgingly get another 14500 battery to have a spare.

I collect various rocks as a hobby. I once took this to the abandoned uranium mine and it promptly alerted me with a radiation level much higher than what is considered to be safe and typical background level. I also did a nuclear bone scan at a hospital and I just took this with me just to see what happens. This device alerted me with a rapid burst of static sound to warn me of the presence of radiation, especially on my arm after the technetium-99m isotope was injected into a vein. Bone scan is a relatively low radiation procedure and the half life of this isotope is very short (6 hours).

Granted its not easy to put CPMs into sieverts, but its a great tool. Video is just some simple uranium glass plates, I guess we could say a positive control.

Ideal for checking radioactive lume when working on vintage watches.

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.

Fonctionne bien mieux que les produits chinois ! Très satisfait

The GQ GMC-300S Digital Nuclear Radiation Detector Monitor Meter Geiger Counter has proven to be an invaluable tool in my watch servicing hobby. I use it specifically for checking if watch dials contain radium, and it performs this task with remarkable accuracy. The digital display is easy to read, and the device is user-friendly, making it simple to operate even for those new to radiation detection. Its sensitivity and reliability provide peace of mind when working with vintage watches. This Geiger counter is a must-have for anyone needing precise radium detection at a great value.

Works. Interesting how radioactive different bits of land are.

Funciona correctamente

Sehr gut, sehr empfindlich. Reagiert deutlich auf Uranglas.