The product adopts the principle of scattering, can monitor air quality, temperature, humidity and AQI Grade. It has 999 groups of data records, can view the data curve, with 3.2-inch TFT full-color display, automatic measurement, real-time date and time, rechargeable lithium battery or separate external USB power supply, stable data, etc. Features: Air Quality Monitor: There are 2 models for option. TC-8100 features 3 channels to detect the number of 0.3um, 2.5um particle size dust, the concentration of PM2.5 and PM10, AQI Grade, temperature and humidity. TC-8200 features 6 channels to detect the number of 0.3um, 0.5um, 1.0um, 2.5um, 5.0um, 10um particle size dust, the concentration of PM2.5 and PM10, and it can detect the class of Class 100 clean room and below clean room, temperature, humidity and AQI Grade. 3.2\