First of all I would like to say that I don't know much about radiation. I'm still learning, but I was looking for a reliable device. This was the cheapest CRM 100 I found. I've looked for several different geiger counters. were cheaper. My first was fine, but I found the reading felt low and random. I chose the CRM-100 and am very satisfied with this device. I've seen some videos of Tom from Anti-Proton.com using the CRM-100 alongside other Geiger counters. Tom gave the CRM-100 a very positive rating. Tom and other reviews are correct, the Geiger-Muller tube is small but I found it to be more sensitive than other devices I've bought before. I recommend this geiger counter over other geiger counters.
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