We all know that air is an indispensable part of our lives. The quality of air is affecting our body and mind, but the air is colorless and tasteless, we can't measure it with the eyes. At this time, we need an air tester to monitor the air quality. Features: Mini and portable, easy to use and carry, can be placed anywhere needed. Large screen display makes it easier to read data. Built-in high accuracy sensor for more accurate and stable detection of CO2 in the air. The different colors of the panel indicators represent different air quality levels and it is perfect for daily air quality monitoring. The USB design is easy to use and can extend the service life. Suitable for many occasions, such as offices, homes, gardens, vehicles, etc. Easy and convenient to operate and read the data. Specifications: Type: A2 Function: Detect CO2, temperature and humidity Screen size: 2.8in Material: plastics+metal CO2 measurement range: 400-2000PPM CO2 accuracy display: ±40PPM Temperature measurement range: 0-50 Temperature measurement accuracy: ±2 Humidity measurement range: 20-90%RH Humidity measurement accuracy: ±5%RH Item size: 85 * 65 * 43mm / 3.3 * 2.6 * 1.7in Item weight: 76g / 2.7ounce Package size: 180 * 120 * 100mm / 7.1 * 4.7 * 3.9in Package weight: 175g / 6.2ounce Packing List: 1 * CO2 Detector 1 * USB Cable 1 * User Manual