co2 detector uses electrochemical gas sensors, which have the advantages of high sensitivity, stable working, long service life and low power consumption. It can save and export data, switch between Chinese and English and other functions. The built-in lithium battery can be used for more than 8 hours. After the calibration of co2 detector, users can directly turn on the detector, which is suitable for medical disease control public places and occupational health detection. Densely populated places, such as meeting rooms, classrooms, exhibition halls, hospitals, shopping malls, bars, restaurants, airports, railway stations, entertainment halls and other places, can use carbon dioxide detector for environmental quality monitoring.