[5-IN-1 Multifunctional Air Quality Monitor]The air quality monitor adopts high-precision and professional sensors, which can accurately detect formaldehyde (HCHO), volatile organic compounds (TVOC), carbon dioxide (CO2), temperature (℃/℉) and humidity (%), let you fully know the air condition. The portable indoor air quality monitor can not only help us detect the air quality of our homes, kitchens, bedrooms, but also schools, offices, cars, hotels, etc. [Accurate Measurement & Vent Design]CO2 monitor has built-in advanced digital sensor, which has fast response speed and high sensitivity. The built-in high-performance chip can quickly process the data acquired by the sensor and calculate the concentration of gases in complex environments, outputting accurate measurement results. The innovative design with the vent allows full contact between the air and the sensor, making the measurement data more accurate and reliable. [HD Screen with Backlight]Air quality monitor features a