Gas Detector, Mini Camera, Voice Recorder manufacturer / supplier in China, offering Portable Mini Radon Gas Monitor Detector Ionic Technology Radon Short Term Average Measurement Range 0-270PCI/L (0-9999 Bq/m³), Portable Mini Radon Gas Analyzer Detector Ionic Technology Radon Long Term Average 2* AAA Battery (Not Included), Wholesale Portable Radon Detector with Real-Time Readings for Accurate Short and Long-Term Air Quality Monitoring in Homes OEM and so on.