I love GQ products and bought them out of curiosity rather than necessity. The very low readings prompted me to purchase low-dose radiation sources. Yes it works as test sources have increased counts per minute from a few to over 1000 (unsure). Not as handy as air quality monitors or EMF-RF, this is a way to detect ionizing radiation. Too bad there's nowhere to hide when the world goes nuclear. This is the gauge you want to avoid when this happens!
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