Corentium Radon Detector

The Corentium home radar detector by Airthings is the first battery-operated, digital radon detector, allowing you to monitor radon in your home without an outlet and without sending away for test results. On-screen results show both long and short term readings, for a quick overview of your radon levels. Unlike a traditional radon gas test kit, receive your first indication of radon levels within 24 hours.

This kit includes one Corentium home radon detector ($130), batteries, instructions and generic carrying case ($10).
$140.
Corentium Home Radon Detector