eCO2/eCH2O/TVOC Gas Sensor Module Zero calibration, high consistency High sensitivity, and low power Automatic calibration, with temperature and humidity compensation UART output Accept customization Application: Car and household air purifiers Desktop air quality monitor Fresh air ventilation system and automatic ventilation fan Air conditioning automatic ventilation and integrated ceiling controller Kitchen and bathroom fresh air ventilation controller, etc Color: As Shown Material: PCB Package Contents: 1 * Gas sensor module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.