[Precise Detection]The three-in-one CO2 monitor is equipped with sensitive and efficient sensors, which can help us detect indoor CO2 in the range of 400~5000ppm, the temperature range of 0~55, and the humidity range of 0~99%RH. [Automatic Calibration]Place the detector in a ventilated place for 24 hours, and the device will automatically calibrate. Support / selection to meet different reading needs. [Sound and Light Alarm]When the detected CO2 concentration exceeds 1000 or our preset value, the CO2 detector will alert us by turning the LED light red and beeping rhythmically. [Multiple Scenes Use]Small, practical and reliable, this CO2 meter is an perfect indoor air quality monitor for our home, office, car, garage, grow tent, etc. [Custom alarm value]You can customize the alarm value of the detector. When the CO2 concentration in the air exceeds the range of the alarm value you set, the alarm will sound. Colour:As shown Material:plastic Package Contents: 1 x CO2 monitor 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.