Temperature difference compensation calibration technology, automatic calibration test results for judging ambient temperature data, long-term records, and tracking of formaldehyde/TVOC concentration trends. You can measure carbon dioxide levels, care about your family's health, find sources of pollution and perform more accurate tests. It can be connected to a mobile power supply to check the sealed space, and can be connected to a charging treasure, making the detection of the confined space more reliable It has a wide range of applications and can be used for greenhouse planting, indoor air detection in farms, and household air detection. Compact body, small size, easy to carry, measure data at any time, Manufacturer: XZXXZSZ