Description: 3 in 1 Portable CO2 Meter Temperature Humidity Sensor Tester Air Quality Monitor Analyzer Carbon Dioxide Gas TVOC Detector. Carbon dioxide detector: Smart carbon dioxide value tester gas analyzer uses air semiconductor TVOC sensor to monitor temperature and humidity of air quality. It is a high-quality air quality detector, using a good-quality electrochemical detection module, with good accuracy, stable performance, strong anti-interference ability, low consumption and long service life. Accurately detect carbon dioxide. The large screen displays power, CO2, temperature and humidity. The product does not need calibration, it can be tested after booting, and it can accurately detect carbon dioxide. Hundreds of ventilation holes at the rear not only accelerate the convection between the air and the machine, thereby realizing effective detection, but also provide a good heat dissipation effect. Specification: Size: 102x52x140mm / 4x2x5.51inch Carbon dioxide measurement range: 400-5000ppm Carbon dioxide and smoke alarm dB: 85dB (1-3M) Material: ABS Temperature measurement range: -9-50°C Humidity measurement range: 20% ~ 95% Smoke sensitivity: 0.1%dB/m -0.3%dB/m Package Includes: 1 Piece CO2 Meter Temperature Humidity Sensor 1 Piece USB Cable 1 Piece Manual : Please allow 1-3mm measuring deviation due to manual measurement. Due to the different monitor and light effect,the actual color of the item might be slightly different from the color showed on the pictures.Thank you!