Product Highlights: 1. 6-in-1 Multi-function -Can test pm1.0, pm2.5, pm10, CO2, TVOC, HCHO(Formaldehyde); 3 display modes: numerical display / curve display / particle number display, click mode switch key to switch it 2. High Accuracy -Laser particle sensor to accurately distinguish 0.3 fine particulate matter; Electrochemical sensor to resolve 0.001mg/m3 of free formaldehyde molecules; Semiconductor TVOC total volatile organic compounds sensor can measure a variety of chemistry pollution such as benzene, toluene. NDIR non-spectral infrared principle CO2 sensor to accurately detect indoor carbon dioxide concentration. 3. Auto-sensitivity -Automatically turns off the screen according to the ambient brightness; store and export data records, draw 24hs real-time data curve, with AQI air quality condition assessment and alarm 4. Inspection of air equipment purification efficiency - Can check the air quality to evaluate the purification efficiency of filter of purifier and ventilator, to remind you to replace filter element Instructions for Use: 1. Click mode switch key enter the 6-channel particle number interface 2. TF memory card can record test data of PM2.5, CO2, TVOC, HCHO 3. Auto-sensitivity and alarm functions can be turned on or off 4. After turn on the detector, the sensor warm-up time is 1-3mins 5. For Initial use, place the device in a well-ventilated environment for 8hrs before use Measurement Indexes: PM1.0/PM2.5/PM10: light scattering test Range: 0-999ug/m³ Resolution: 1.0ug/m³ CO2: NDIR test Range: 400-5000ppm Resolution: 1ppm Formaldehyde: electrochemical test Range: 0-1.000mg/m³ Resolution: 0.001mg/m³ TVOC: semiconductor sensor Range: 0-9.999mg/m³ Resolution: 0.001mg/m³ Packing list: 1 X Air quality monitor unit(with TF card) 1 X USB cable 1 X User manual