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

This is not the product if you want honest readings. I bought 1. Used it for 2 weeks, had very high readings in my living room. The block reset worked for another week. Very high. Bought 3 more Decided I should check everything to decide which room was most important. Place all 4 in the same spot. Anything within 24 inches to see if it reads the same. A week later they all have 4 different indications. Difference 5.0 from lowest to highest. Dropped them and tried again. The same thing.