Geiger Counter Nuclear Radiation Detector - FNIRSI Radiation Dosimeter with LCD Display, Portable Handheld Beta Gamma X-ray Rechargeable Radiation Monitor Meter, 5 Dosage Units Switched

It does work! shows background radiation around .09 usv/h average. When I put it on top of a smoke detecter it jumps to .3 usv/h average. Granted may not be a precision scientific instrument but for detecting ionizing radiation it does the job. Also had a good quality solid feel when held in the hand. LCD also a high quality screen. Compact and looks cool. A must consider for anyone looking for a geiger counter for home testing peace of mind at a very good price!!!

15 years ago I woked as a Forester in Northern WI. I got the opportunity to work inside the Enterprise Radioactive Forest (google this). A forest that the USFS experimented on with Cesium in the 1970's to help deterime what would happen if the big one ever happened and what the effects of radioactive fallout would be on our forest resources. The project ended decades ago, but the forest continued on. When I worked as a forester, I can say it was the most bizzare forest I ever worked in. The trees all grew weird, were stunted, or misformed. A lot had wires coming out of them from the experiment. I also found alunimum rods everywhere. I picked up one of these rods and used it as a walking stick during the project, and kept it as a momento of working on the project (nothing illegal, it was trash). Years later, I found it in my garage and kind of wondered, is this radio active? Seems logical that it could be. All reserch I did on transfering of radiation to metals like aluminum said it was unlikely, but I was curious so I bought this detector. Glad to find out that it wasn't and I could keep my momento. It actually did not register anything, while bannanas sure did.

OK this was one of these items that I really didn't have to have but wanted to get. I was first attracted to the price point for a functional Geiger counter and it has some nice options with it. This counter uses a GM tube I do believe and appears to give me consistent readings when using it with a known radioactive source. It will detect xray, beta and gamma particles and I really like the screen and setting options. Battery life for me has been super good and I like the size and feel in my hands. It is very easy to use but I will say that an area that it could improve in is it's ability to detect and display radiation doses faster and I do wish that it would give the characteristic clicking sound when the GM tube is struck by radioactive particles. So speed of detection and that sound are my only real complaints. I guess both of these are typically available on higher priced units. All in all, I'm very happy with my purchase and it's cool to check out uranium glassware, gas lanterns mantles and smoke detectors. Hope that it works well for a long time to come.

This is a very handy tool especially if you're interested in whether or not the people at the grocery store are selling you fish that may or may not be radioactive. It's also good for checking the basements of houses for radon gas. I find it interesting as to the things that are in our environment that actually are radioactive things you wouldn't expect like maybe the coal pile behind somebody's house. The battery life is very good in the fact that you can charge it up and not have to recharge it for 2 or 3 days even if you're not using it sometimes things just discharge this is not the case with this particular device. I was very surprised to get a geiger counter of this quality in the fact that it is able to read not just one or two scales of radiation but RF radiation as well this is a good machine. It's very sensitive it has the ability to read as low as one renkin hour.

This device is an absolute disaster and a scam. IT FAKES READINGS. When I decided to invest in a geiger counter for my personal safety and peace of mind, little did I know that my hard-earned money would be wasted on an absolute disaster of a device. The geiger counter I purchased, touted as a reliable tool for detecting radiation, turned out to be a nightmare in every possible aspect.The most important thing by far however are the fake numbers this geiger counter shamelessly produces. It's as if the device has a mind of its own, conjuring up figures that have no basis in reality. When placed next to a United Nuclear test card, it would completely make up fake numbers. Not only that, the CPM would always only change by weird, fixed pattern. This leads me to believe that they are making up numbers. This is absolutely unacceptable for a radiation detector that touts itself as a health tool.The geiger counter's battery life is nothing short of abysmal. It's as if the manufacturers took pleasure in designing a device that drains batteries faster than a leaky faucet wastes water. Within a very short period of time, the FNIRSIR began to lose charge quickly. In under a couple hours, it was fully dead with the device being very hot. This is absolutely unacceptable for a device that’s supposed to keep someone safe.But the cherry on top of this disastrous cake is the fact that the UI exacerbates the device's already apparent accuracy issues. The tiny, barely legible screen displays readings in a font size that requires a magnifying glass to discern. And when the readings themselves are as unreliable as a coin toss, struggling to decipher them due to poor UI design becomes an added insult to injury.In conclusion, the geiger counter I purchased has turned out to be a monumental disappointment. Its abysmal battery life, laughable accuracy, and propensity for producing fake numbers have shattered any semblance of trust I might have had in its functionality. I could forgive any of these problems if only it would actually accurately read radiation levels. I would strongly advise anyone considering buying this geiger counter to think twice and explore more reliable options on the market. Please look at the other 1 star reviews and videos and notice the random CPM and see how many people have the same problem I have. Your safety and peace of mind deserve better than this sorry excuse for a radiation detection device.

Before I begin, I need to say that this is a radiation counter that has been designed to be a dosimeter. It is not a Geiger counter. Other reviewers think that it us a Geiger counter which is something entirely different. The only thing that the two have in common is that they both use a Geiger-Mueller tube. This instrument measures the accumulated radiation exposure in fractional units of Sieverts over time. This is a high quality dosimeter considering the price. It can read gamma, beta and x-radiation dosages. Two screens are provided: the first is numerical and the second is graphical. The manufacturing quality of this instrument is evident at first glance. It is beautifully packaged in order to protect the Geiger-Mueller tube in shipping which is otherwise subject to shock breakage. I purchased this item in order to monitor radiation dosages in two places in my home. The first is an activated charcoal filter that I have on my water supply in the basement while the second is a reverse osmosis system with charcoal filters under the kitchen sink. Since there is radon in my well water supply, I prefer to remove as much as possible before it is delivered to the faucets in the house. It also serves to reduce the radon levels in air due to cooking, washing, showering and laundry. Capturing the radon in activated charcoal will also capture radon decay products (daughter products). Some of these have very short lifetimes, but some are extremely long and tend to build up in the activated charcoal filters over time. I wanted to see how these radiation dosage levels increased over time in order to determine the optimal time to change the filters. The first thing that I noticed was that in just one week, after a basement filter change, the radiation had already built up by a significant amount. The radon radioactivity in our water is approximately 3000 pCi/L. If allowed to vaporize due to cooking, washing, bathing and laundering, this amount of radiation could add about 0.3 pCi/cubic meter to the air. The radiation dosage level that was measured close to the tank was 1.4 uSv/hr according to the meter. If multiplied by the number of hours in a year, 8760, we arrive at the accumulated dose per year which is 12.3 mSv. This is the amount of radiation exposure that would be possible were a person to stay in proximity to the tank for an entire year. This exceeds the NRC dosage guidelines of 1 mSv (0.1 rem) per year. Clearly, the filter should not be placed anywhere near where people or children would normally gather or play, for example, a finished basement. I will be monitoring the activated charcoal filter tank for several weeks to see if the radiation buildup reaches equilibrium as the filter capacity is exhausted. This will provide a guideline for how often the filter should be replaced. Short term exposure to the filter during a filter change should not be an issue provided that safe handling practices are followed. As a followup, I have decided to change the activated charcoal filter in the basement four times per year since no one is in proximity to the filter most of the time. One additional piece of information: For occasional proximity to radiation by workers, the annual permissible dose is 50 mSv (5 rem) per year. On the subject of radioactivity and dosage; they are not the same, pCi/L cannot be converted to uSv, or vice versa. The first is an instantaneous radiation level in disintegrations per second from a liter of water, while the second is an accumulated exposure dosage over time. Finally, I am not a licensed professional engineer or health physicist. Always consult with a professional engineer or health physicist who is. Most water system installers pose as being knowledgeable, but they are not. While they may attend training courses in radon mitigation, they do not possess the knowledge required to make sound health decisions for your family.

The good:The case is robust and the display and buttons are easy to read and use. The lithium battery is easily replaced by the user if necessary.The GM tube is easily swapped with a J321 tube if desired.The bad:The manufacturer recently changed from the J321 GM tube to smaller GM tube, which decreases the sensitivity, to what appears to be similar to an HH442 or J613 tube (but a little shorter). These use a solid metal cathode and so are insensitive to beta radiation.There is no audible click, but is easily modified to provide a click upon detection.The USB connector is used for recharging only. There is no data logging available through the port.Update:I added a J321 GM Tube. (Just unsolder the old one and snap in the new one. There was no need to add a loading resistor with mine.) Sensitivity to background radiation is about 4x greater. This tube cost about $20 with shipping direct from China. The old tube had a metal cathode and was almost certainly non-responsive to alpha and beta particles. This tube has a glass cathode coated with a nearly invisible layer of what appears to be aluminum to make it conductive, so it may be sensitive to beta particles. I expect alpha particles are stopped by the plastic of the case, and the glass of the GM tube. The ability to detect beta particles and the greater volume of the tube which allows it to intercept more gamma radiation together explain the greater sensitivity.

Works. As soon as I turned it on it started measuring background radiation in the 0.02 to 0.11 uSv/h. But I couldn’t really tell if it was working or not or just measuring some kind of noise.So I drove to work and back home and walked around at work but nothing triggered a higher reading.So I took it to a lab where they have Cobalt 60 readily available for radiation testing and just walking into the outside room behind the multiple feet of lead and concrete my meter went from 0.01 to 1.0uSV/h in just a few seconds. The little red light at the top wasn’t flashing anymore, it was solid red. So I knew that meant it was measuring the radiation and it was tripping an alarm to let me know I was way over the 1uSv/h alarm limit.That was good enough for me.On another note, the menu system is a little kludgy and you cannot save a screenshot or any history which is kinda disappointing, but for a quick measurement for on the spot radiation testing, I would say it does what it promises. I. Just wish it would connect to my phone through Bluetooth so I can download the data to save for later.

Sehr gut verarbeitet. Die Displayschutzfolie auf der Vorderseite kann problemlos draufbleiben.Verbaut ist eine gute M4011-Röhre aus dem Jahr 2025. Ich habe außerdem die alternative Open-Source-Firmware von Gissio: "RadPro installiert, die deutlich!! umfangreicher ist, damit ist auch das bekannte Geigerzähler Klicken verfügbar

No way to tell if it's accurate. But the radiation levels do change over time. So far the radiation levels are low.

Works effectively as a radiation detector. Have used to check in house and surrounding areas around home and office. Helps keep peace of mind. Low battery consumption.

Aprés plusieurs essais j ai réussi a le flasher avec le firmware : radpro-fnirsi-gc01_ch32f103r8-en-3.1.1 !!La puce est illisible on ne sait pas si c est un ch32 ou un apm32F, le tube c est écrit dessus c'est bien un GM4011.Flash réussi avec la version de RADPRO pour ch32f, l autre ne marche pas.le produit est très sensible il bloque / efface le firmware des qu on le branche sur le pc, après il s allume plus ! j ai cru que je l avais bousillé.Pour le refaire marcher, il faut downloader le firmware d origine chez FNIRSI et le copier sur GC01(BOOTLOADER) drag and drop, et la il remarche de suite !!Aprés pour flasher Radpro, contrairement au firmware d origine il faut rester appuyer sur power quand on transfère le .bin !

Very effective. My cat underwent radioactive iodine treatment, and I needed to protect myself. It's accurate and quick to detect. All my cat had to do was walk by or stand for any period of time. period of time.