【PREMIUM DETECTOR】: This multifunctional air quality monitor can accurately detect the current CO2 concentration, temperature, and humidity in the air. It can help you understand indoor air quality at a glance. 【CO2 CONCENTRATION STAGE & SOUND ALARM】: This CO2 detector is designed with 3 stages of AQI. It will alarm you when the AQI is beyond the safe value you customized. 【CONVENIENT CALIBRATION】: To ensure the accuracy of measurement, this CO2 monitor supports the calibration function. Press three buttons at the same time in an open environment and let it stand for 200 seconds to calibrate this CO2 meter easily. This CO2 detector uses the NDIR CO2 sensor. 【LONG BATTERY STANDBY】: A 2400 mAh lithium battery is embedded inside the indoorCO2 monitor, supporting a long time of continuous use, before it adopts a large and distinct LED screen for ease for temperature or data viewing. display based on your need. 【WIDE APPLICATION】: A hanging hole is designed on the back of this portable CO2 detector so that you can hang it up to the wall for easy viewing. The indoor CO2 meter for grow tents is ideal for use in grow room, offices, kitchens, schools, kitchens, schools cellars, and cars.