Uses high-precision TVOC semiconductor sensors, with stable working performance, can accurately detect carbon dioxide value. Adopts electrochemical detection module with detection performance stability, anti-jamming ability, low consumption, and can provide long service time. Large LED display, you can clearly see the amount of electricity, CO2 value, TVOC value, HCHO value, temperature and humidity. and switchable, real-time detection, automatic data refresh, with multi-use. Adopts air convection design, which can provide more accurate detection results. Equipped with air quality level dividing function, three different colors correspond to different air quality levels. air quality, allowing you to know the current atmospheric conditions more accurately and graphically.