1. Multifunctional Air Quality Monitor: The smart carbon dioxide tester uses an air semiconductor TVOC sensor to accurately detect carbon dioxide, and can also monitor the temperature and humidity in the air, and the value of formaldehyde. No need to calibrate, just start the test. 2. High Accuracy: The CO2 meter adopts high quality electrochemical detection module, which has high accuracy, stable performance, strong anti interference ability, low consumption and long service life. 3. Large Screen Display: The large screen displays power, CO2, temperature and humidity. Different font colors show different air quality, 400800ppm: green flashing, 8001800ppm: orange flashing, more than 1800ppm: red flashing and buzzer alarm. 4. Multiple Ventilation Holes: 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. 5. 1200mAh Rechargeable: Built with 2000mAh rechargeable battery and one USB cable, the carbon dioxide monitor is USB rechargeable, which is very convenient to use.