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Amazon.com: 15-in-1 Smart air Quality Monitor Indoor,Home air Quality Tester with PM, CO2, CO, TVOC, HCHO, PM, AQI,Suitable for Home, School, Hotel,Office,Car(red+Black) : Industrial & Scientific,

Amazon.com: Air Quality Monitor, Multifunctional 6 in 1 CO2 Meter Air Quality Monitor Temperature PM2.5 TVOC HCHO Detector USB Charging, Test Carbon Dioxide Detector Temperature and Humidity Indoor(White) : Industrial & Scientific,

Amazon.com: GZAIR CO2 Data Logger Monitor, Wall-Mounted Carbon Dioxide Detector, IAQ CO2 Detector, NDIR Sensor, Temperature and Humidity, 0~5000ppm ,

INKBIRD Portable CO2 Detector with Bluetooth, Smart Indoor Air Quality Monitor, can detects CO2, Temperature, Humidity, etc., Electronic Ink Display &