DESC: Digital Continuous Radon Gas Monitoring with Home Radon Alarm As Seen On National TV. Safety Siren Pro 3 Radon Gas Detector, HS71512. The only EPA evaluated radon gas alarm for home use with continuous radon gas monitoring. Clear, easily read digital radon gas level display. This electronic radon device monitors both short-term and long-term radon level averages. Gives first radon gas reading after 48 hours of radon gas sampling. Radon gas in air or water is a health hazard resulting from uranium breaking down in soil. Exposure to radon can cause lung cancer. Continuous home radon monitoring is recommended in high radon areas or when radon mitigation systems are used. See in.Radon Facts in. below the radon monitor information. Family Safety Products' Electronic Radon Monitor Features: USA EPA Evaluated. Not for sale to residents of the State of Iowa nor for shipment to Iowa residents per Iowa Department of Public Health Rules, Chapters 43 (136B). Please contact the Iowa Department of