A25 series air quality meters are used to measure PM2.5 concentra�on. A25 series can be used in homes, offices, hotels, schools, factories, hospitals, restaurants, and other public places. Features Precise PM2.5 concentra�on based on pre-calibrated sensors Temperature measurement (°C/°F) Humidity measurement (A25D) Emo�con display LCD backlight and red backlight alarm Ba�ery status, auto power off Formaldehyde (mg/m³) Characteris�cs Standard accessories 1m micro USB cable, wall mount (A25M), English manual A25M: 520mAh Li-ion ba�ery; A25D: 1500mAh Li-ion ba�ery Product size Standard individual packing Standard quan�ty per carton Standard carton measurement Standard carton gross weight