We all know that air is an essential element of our life. Air quality affects our body and mind, but air is colorless and tasteless, we cannot measure it with eyes. At present, we need an air tester to help monitor air quality. Features: Large screen LCD, different font colors display different air quality, green 400-799ppm, yellow 800-1199ppm, orange 1200-1599ppm, red 1600-1999ppm, 2000ppm above four colors flash at the same time. The product is compact in size and easy to carry. The ventilation holes on the back not only accelerate the convection between the air and the machine, so as to achieve effective sensing, but also provide fine heat dissipation effect. The product does not need calibration, startup can be tested, accurate detection of carbon dioxide, used in greenhouse agricultural production, production warehouse, laboratory, family, etc. Widely used and practical, used for epidemic prevention and control to detect the CO2 concentration in the population, to control the number of people and avoid the risk of cross infection. 1200mAh large capacity battery for long battery life work, Type-C charging interface, easy charging. Features: Color: black, white (optional) CO2 measuring range : 400-5000ppm Temperature measurement range: 0-50 Humidity measuring range: 0-99RH Battery: 3.7V, 1200mAh Item size: 90 * 70 * 35mm / 3.5 * 2.8 * 1.4in Item Weight: 117g / 4.1 ounces Package size: 140 * 125 * 41 mm / 5.5 * 4.9 * 1.6 inch Package weight: 173 g / 6.1 ounces Packing List: 1 * Air Quality Analyzer 1 * USB Cable 1 * user manual