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Specification: 1. 5-in-1 Multi-function -Can test pm1.0, pm2.5, pm10, CO2, 6-channel particle counter PM 0.3,0.5,1.0,2.5,5.0,10; Automatic calibration with service life of 8 to 15 years; Clock display:Date&Time 2. High Accuracy -Laser particle sensor to accurately distinguish 0.3 fine particulate matter; NDIR non-spectral infrared principle CO2 sensor to accurately detect indoor carbon dioxide concentration; With 48-hour automatic baseline calibration function, and comprehensive assessment of ambient air quality with alarm 3. 10W+ data records storage and export - standard 128m TF memory card can stotage 100K+ data; Supports larger capacity memory cards, storing 900+ days of test data; Data storage frequency: once a minute; Historical data records can be viewed on the machine; Data records can be exported to the computer in TXT file 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. TF memory card can record test data of PM1.0,PM2.5,PM10, CO2, PM0.3,0.5,1.0,2.5,5.0,10 2. Auto-sensitivity and alarm functions can be turned on or off 3. After turn on the detector, the sensor warm-up time is 1-3mins 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 Packing list: 1 X Air quality monitor unit(with TF card) 1 X USB cable 1 X User manual