Uses high-precision semiconductor sensors, with stable working performance, can accurately detect the carbon dioxide value. 2.8 inch large LCD screen, you can see the electricity quantity, CO2 value, HCHO value, TVOC value, temperature and humidity clearly. Real-time detection, automatic data refresh. Adopts air convection design, which can provide more accurate detection results. The product does not need calibration, it can be tested after startup, and it can accurately detect carbon dioxide. Equipped with an air quality level division function, 4 different colors correspond to different air quality levels, allowing you to know the current atmospheric conditions more accurately and graphically. > Widely applications: agricultural planting, greenhouse vegetables, production warehouse, material processing, home interior, business offices, etc.