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

I have been looking at Geiger counters for years, but haven't been able to justify the expense (until now). Basically, I wanted it because while I don't personally work with radioactive materials or radiation, I do work with people who do, and contamination does happen. So basically I was looking for something for everyday carry. I was also interested in confirming that granite and quartz counter tops, as well as tiles, were not radioactive. I also know a lot of people with antique china (some of which is radioactive). Okay, I mostly wanted it as a gadget, but okay, I also wanted it as a prep (eyes rolling). No seriously, if you ever actually need a Geiger counter as a prep, it might be too late to buy one. So I have a few basic preps, and now this is one of them. People often wear those little radiation dosimeter badges. I have often thought this was a bit weird, because basically they tell you that you were exposed a couple of weeks ago. Whoops - it would have been nice to have known that when the exposure was happening, so you could have stopped it. So I have been looking at a number of Geiger counters for a while, and the thing that pushed me over the edge, is that the cat was about to have I-131 treatment for hyperthyroidism (this is where the patient, in this case our cat, is injected with radioactive iodine to treat hyperthyroidism). The patient (again in this case our cat) ends up fairly radioactive for a few weeks. My biggest problem upon receiving the device is that I had no way to test it. I could find literally nothing in the house that was radioactive (thank goodness). None of the china was radioactive, none of the tiles and countertops are radioactive, and I couldn't find a single old watch or clock (i.e. with radioactive glow in the dark hands). When the cat's treatment started, this problem was solved. The cat was hot, the cat's thyroid was even hotter. The litter box was hot. The cat's vomit (sometimes invisible, except to the naked foot) was hot, and the cat unfortunately in one instance missed the litter box, so then that spot of carpet was hot. I really like the device. It has a very nice display and menu options. The battery life is great: I haven't checked, but I think it lasts more than 24 hours with the display continuously on. I like that it has a rechargeable battery that you can replace, and I like that you can recharge the battery via USB-C (i.e. while the device is running). I like that it has an alarm, so if the cat sneaks up on me, I know right away. The device is very light, so I can put it in my bag and forget that it is even there. Based on what I know, GQ is quite a reputable company in the affordable Geiger counter space. The plastic looks a bit brittle, but in practice I have (unfortunately) whacked it and dropped it a couple of times, without incident (thank goodness). There are still a few Geiger counter features that I would like (again, mostly thinking of this like a gadget): - A large and sensitive paddle tube - A mica window to detect alpha particles - A gamma spectrometer I also really like the idea of ultra compact Geiger counters (like keychain ones) for everyday carry, but in practice there is a tradeoff between size and sensitivity. One thing that would be really nice for everyday carry is bluetooth connectivity. It occurs to me that one of the most likely reasons to be exposed to radiation, is if someone you know is having some sort of medical treatment and hasn't told you. It would be super embarrassing if you were in a conference room, and your Geiger counter were to go off, because surprise, your boss's boss is having brachytherapy for prostate cancer. Awkward. So for everyday carry like this, it would be better if the device were just to inconspicuously show a notification on your phone. So I don't know if this will be my last Geiger counter, but this is the one that finally bought, after years of wanting one. All in all, I would say that the perfect Geiger counter is the one that you actually own, and that you are carrying when you are exposed. This is the one that pushed me over the edge, and so for me, right now, I would say this is the perfect Geiger counter.

A decent starter dosimeter. It’s lightweight, cheap, and does its job. It’s accurate enough to know if you have to get out of a place and its design makes it easy to use. Is this the best? No, is it great for the money? Absolutely.

This is a pretty amazing little Geiger counter. It’s got the “clicking” sound, battery lasts forever. Really happy with the purchase.

power button is not reliable, otherwise works as expected. Has been useful to track my radiation treatment

Durable, strong battery, simple interface, easy on the eyes,

Very pleased with this little Geiger counter. Bought it for detecting Uranium Glass, for just having fun with, for law enforcement purposes, and for end of the world scenarios that I hope never happen. Down-sides: It’s slow to react, it doesn’t have the ability to detect Alpha particles (they are stopped by everything, including paper…not this detector’s fault), and there isn’t the ability (that I’ve found so far to change between mR/hr and micro R / hr Pros: It’s very affordable and seems to be picking up on Beta and Gamma just fine. I was glad to see it really responding to the Uranium glass. Not only is that exciting, it gives it a solid, practical use for more mundane purposes than the end of the world. A special note for Law Enforcement and Firefighters. Get some training. There are amazing courses put out by the federal government, free of charge, at the Nevada National Security Site through CTOS. Check your state disaster agencies. They’ll fly you out there for free m, give you food and lodging all week to teach you about using meters to detect ionizing radiation on a site where nukes were actually detonated in the 50’s and 60’s. After an explosion, you don’t know if the explosion is the terrorist event or if it was simply a mechanism for dispersing radiological material. A little meter like this can help you protect the public by alerting you about their presence, getting people out of the area, and calling for higher levels of help.

9.30.025..1st impressions 1st 45 minuts... This may be the best ever for the money.. but... it is not exactly novice friendly. There is a huge presumption that the user is familiar with Giger technology and jargon...the user guides seem complete but make no sense without a guide book. perhaps when I get through the guide (an afternoon) I may get it sorted...a well thought out quick guide would be nice. I dont mean you have to be an nuclear Eng. but what is the most likly use and terminology I should know to get quick basic use from this... I am sure you tube will come to the recue but gee guys---can you put on one page for a quick start? I even have questions about how to charge the battery or use direct current... U-know like can the battery be charge in the unit ? what are the input volts and amperages. required for charging

The Gmc-800 that I received in December 2024 was of high quality and is easy to use. The rechargeable AA size battery it comes with can last days on a charge even with display and data logging. Mine arrived fully charged and configured (presumably calibrated too). The screens and buttons are very intuitive to use. This geiger counter is more expensive than some more popular Amazon selections but this one comes with the sensitive J321 tube, as you can see in the picture. This is a good value.

Di facile utilizzo, il menù è molto semplice non servono le istruzioni. Funzionamento molto stabile non oscillano i valori , naturalmente bisogna appoggiare e lasciarlo fermo. Illuminazione di vari colori, fantastica, suono molto bello con volume. Grafici e interfacciabile con pc. Batteria ricaricabile. È piccolo e molto leggero, unica accortezza non farlo cadere! Ad essere pignoli avrei messo un laccetto di sicurezza, che in qualche modo metterò.

Ok

Ta bueno

Very good product

Perfect for my needs. I wanted a good balance between price, accuracy and quality. After several days of reviewing many radiation detectors, this one kept coming up as a highly rated product for its price point. If like me you are mainly interested in having this as a preparedness tool and playing with from time to time, I would highly recommend this device.