I have purchased 2 charcoal based radon tests and this permanent electronic meter. Both charcoal tests gave readings of >>15, while Elifecity gave a continuous reading of 1.08 to a maximum of 4.2, with most readings in the 2.0 range, which is normal. A professional licensed tester came to see which test was wrong. The tester returned a 3 day reading of 14-26 with a 72 hour average of 20! If we were solely relying on this electronic device, we would not be trying to lower radon levels and would have a much higher risk of developing lung cancer. This product should NOT be on the market and if it is still available on Amazon in 3 months I will take action to remove it or await certification results. DO NOT BUY
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