About this item 【5-in-1 Air Quality Monitor】 Can measure HCHO, TVOC, CO2, temperature (℉/℃), humidity. Independent sensor for accurate measurement. 【Auto Alarm】When the detection value of HCHO, TVOC, CO2 is higher than the set value, the machine will sound an alarm. Can be muted if you want. 【Automatic calibration, simple operation】After the machine is turned on, it will enter the 2-minute automatic calibration time, no strict requirements on the calibration environment. Save the trouble of frequent calibration, smart and convenient. 【Charging and Plugging Dual Use】It can be used by plugging in, and the monitor is continuously turned on; it can also be used by charging: fully charged in 4 hours, it can last for 23 hours. With low battery prompt. 【Portable】Small design, can stand with a back stand, and can be carried in a tool bag. Widely used in bedrooms, offices, cars, etc., allowing you to breathe air with peace of mind. › See more product details