Review on Portable Airthings Corentium Home Radon Detector 223: Lightweight, Easy-to-Use, USA Version, pCi/L by Adam Jenkins

I ran 2 radon tests in carbon cans simultaneously with one of the Corentium detectors. Accustars were placed a few feet apart and measured 7.0 and 7.1, while Corentium found 10.5. I bought 2 more Corentiums thinking the original was broken. I've seen that again and again. With 3 of them an inch apart I got short term calculations of 9.81, 12.62 and 14.75 in 3 days. The long term values I got were 13.72, 14.4 and 17.62. That's a lot of discrepancy for device testing. . I am not comfortable with this product and am sending them all back. Unfortunately, at nearly $200, I strongly recommend NOT buying them.