5-in-1 Smart Function -portable air quality monitor can measure Indoor air pollutant of pm1.0, pm2.5, pm10, TVOC, HCHO(Formaldehyde).High Precision Air Sensors -Laser particle sensor can distinguish fine particles of 0.3 microns; Electrochemical HCHO sensor to resolve 0.001mg/m3 of free formaldehyde molecules; Semiconductor TVOC total volatile organic compounds sensor can measure dozens of chemistry pollution such as benzene, toluene;Upgrade and Optimization - 16-bit AD processing chip, ARM core processor, 3-wire fan feedback compensation, laser attenuation software compensation, effective filter protection, improve measurement accuracy.