Features: The intelligent carbon dioxide value tester uses air semiconductor sensors to monitor air quality, temperature and humidity. Adopting superior electrochemical detection module, with high accuracy and stable performance, it can accurately detect carbon dioxide value. Strong anti-interference ability, low power consumption and long service life. The product does not need to be calibrated, it can be tested after starting up, and it can accurately detect carbon dioxide. Different colors correspond to different air quality, suitable for offices, homes and other occasions. Hundreds of ventilation holes on the back of the casing can not only accelerate the convection between the air and the machine, thereby realizing effective detection, but also provide good heat dissipation effects. Widely used: agricultural planting, greenhouse vegetables, production warehouse, material processing, home interior decoration, etc. Three in one: Large screen displays power, carbon dioxide value, temperature and humidity. 5in1: Large screen displays power, co2 value, tvoc value, hcho value, temperature and humidity. Specification: Name: Air Quality Detector Model: 5in1black Battery: 1*3.7v, 1200mah lithium battery (included) 5in1:Co2-Scale detection: 100-5000ppm, +50 + 5% ppm co2 detection Sensitivity: 1ppm Tvoc-Scale detection: 0-2.0 mg/m; Tvoc is total volatile organic compounds, the main sources are paints, coatings, adhesives, fabrics, textiles and so on. hcho-scale detection: 0-0.6 ma/m; Temperature measurement range: -10 to 50 A Temperature measurement accuracy: 1 Humidity measurement range: 0%-99% rh Humidity measurement accuracy: rh 2% rh Item size: 90*70*35mm / 3.5*2.8*1.4in. Product weight: 129g Packing size: 11.5.0*11.5*4.5cm Package weight: 191g Packing list: 1 * Carbon dioxide detector 1 * usb data cable 1 * English user manual