The simplest way to check its calibration would be take your meter to
a building where its known correct.Your local city or govenment
offices are correctly tested. I would call you building inspector, or
health dept, even engineer or architect, im sure they could find out
their buildings radon level in a phone call and let you leave your
meter there for testing. When I see a pro device costing thousands to
measure any number of things and a home owner unit of hundreds I know
its not going to have a low margin of error or have the quality of
It's naturally occurring.
Radon is one of the byproducts of the radioactive decomposition of Uranium,
which, in turn, is found in granite. Radon has a half-life of about 3.5
days, so even if it were dumped somewhere, it would be undetectable in a
couple of weeks. Uranium, however, has a half-life measured in billions of
years, so the rocks under your house will be producing Radon until the sun
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