We all know that air is an indispensable part of our lives. air quality affects our body and mind, but air is colorless and tasteless, we cannot measure it with our eyes. At this time we need an air tester to help monitor the air quality. Features: Large lcd screendifferent font colors show different air quality. Green400-799ppm Yellow800-1199ppm Orange1200-1599ppm Red1600-1999ppm 2000ppm above four colors flash at the same time. Size and easy to carry1200mah large capacity battery for a long time working time type-c charging interface easy charging Easy to usingThe ventilation holes at the rear not only accelerate the convection between the air and the machine to achieve effective detection, but also provide a fine heat dissipation effect. The product does not need calibration boot can be tested for accurate detection of carbon dioxide used in greenhouses. ApplicationWidely used and practical for epidemic prevention, and control to detect the concentration of co2 in the population, in order to control the number of people and avoid the risk of cross-infection. Or family of agricultural production warehouse laboratories, etc. Specifications: Color: black white (optional) Co2 measurement range: 400-5000ppm Temperature measurement range: 0-50 celsius humidity Measurement range: 0% -99% rh Battery: 3.7v 1200mah Item size: 90 * 70 * 35mm / 3.5 * 2.8 * 1.4in Item weight: 117g / 4.1ounce Package Information: Package size: 140 * 125 x 41mm / 5.5 * 4.9 * 1.6in Package Weight: 173g / 6.1ounce Packing list: 1 * air quality analyzer 1 * usb cable 1 * user manual