Digital Continuous Radon Gas Monitoring with Home Radon Alarm Protect your family from lung cancer from radon gas exposure with the only EPA evaluated radon gas alarm, the Safety Siren Pro 3 Electronic Radon Gas Detector from Family Safety Products. As seen on TV, this is not like a single use radon test detection kit: this digital radon gas monitor for home testing is a continuous radon tester that performs continuous radon gas monitoring. The clear, easily read digital radon level display shows short-term radon levels as well as long-term radon level averages. The Safety Siren electronic radon monitor gives its first radon 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. Radon gas levels change according to humidity and season. See in. Radon Facts in. below the radon monitor information. Family Safety Products' Electronic Radon Meter 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 Public Health at (515) 281-7689 for further information. Numeric LED radon gas detection level display range: .1 to 999.9 in pCi/L. Short and long term readings. Short-term readings: 7 day radon average. Long-term readings: radon averages since powered-up or last reset. 5-year maximum. Audible alarm if short or long-term radon gas averages are 4 pCi/L or greater. Continuously samples air . Display updates hourly. Failsafe self test: every 24 hours. Error code displays if test fails. 4 function menu button Green LED illuminates next to S (short-term) or L (long-term) display. User can manually test detector operation. Button to mute or reactivate audible alarm when unit is in alarm.