We all know that air is an integral part of our lives. The quality of the air affects our body and mind, but the air is colorless and odorless, and we cannot measure it with the naked eye. Now we need an air tester to help monitor air quality. feature: Super large LCD screen, different font colors display different air quality, green numbers, yellow numbers, orange numbers, red numbers, four colors above 2000ppm flash at the same time. The product structure is compact and easy to transport. The ventilation holes at the rear can not only accelerate the convection between the air and the machine for effective detection, but also provide good heat dissipation. The product does not need to be calibrated, it can be measured immediately when it is turned on, and can accurately detect carbon dioxide. Used in greenhouse agriculture, production warehouses, laboratories, households and other agricultural production. Wide range of uses and strong practicability. It is used for epidemic prevention and control, to detect the concentration of co2 in the crowd, to control the number of people, and to avoid the risk of cross-infection. Large capacity 1200mah battery, long working time, type c charging interface, easy to charge. Specification: Color: black, white (optional) carbon dioxide Measuring range: 400-5000ppm Temperature measuring range: 0-50℃ Humidity measurement range: 0%-99%ur Battery: 3.7v, 1200mah packing list: 1 * carbon dioxide detector 1 * USB data cable 1 * English User Manual