This item is good for 1 Electronic Radon Gas Detector

Digital radon gas alarm for your home. Learn if your home or business needs radon mitigation.  This continuous radon gas monitor is a radon tester that performs continuous radon gas monitoring and gives its first radon reading after 48 hours of radon gas sampling and provides updates every hour on the numeric LED display screen.

http://www.radondetectionproducts.com/