RAD-S80 Radon Gas Sensor — Electrostatic Collection Radon Detector for Continuous Environmental Monitoring Shenzhen, China — The RAD-S80 is a static radon detector engineered by Wanyi Technology (brand: CESTSEN) for long-term continuous monitoring of radon concentration in indoor and environmental air. Built on a planar silicon detector and an electrostatic collection chamber, the RAD-S80 measures radon and its daughters across an extremely wide range from 2 to 300,000 Bq/m³