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http://www.thebestdealsclub.com/2020/01/corentium-home-radon-detector-by-airthings-223-portable-lightweight-easy-to-use-3-aaa-battery-operated-usa-version-pci-l-for-99-99-at-amazon/
Corentium Home Radon Detector by Airthings 223 Portable Lightweight Easy-to-Use (3) AAA Battery Operated USA Version pCi/L for $99.99 at Amazon