Description 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 colorle and tastele, we can 39;t measure it with the eyes. At this time, we need an air tester to help to monitor the air quality. Features: Auto calibration and manual calibration. CO2/RH/temperature monitor tracer. Audible and visible alarm. Chart with variable time zoom levels. Can be powered by battery(not included), the air quality monitor makes it easy to take measurements from one room to another in order to get an overview of the air quality in a home, workplace, school, a daycare centre or any other location. The air quality monitor is also an eential tool to use when performing property inspections or when using any household tools to see if there is any abnormal amount of toxin release. The measurement is displayed on a high definition screen, small and light design for easy carrying. Widely be used in home, office, enterprise, government, school and car, etc. Detect and monitor air problems at any time to ensure the safe of family members or employees. Specifications: Color: white, black (optional) Material: plastics CO2 measuring range: 0-5000ppm Temperature measuring range: 32F to 195F (0C to 90C) RH measuring range: 5-95% Item size: 120 * 90 * 34mm / 4.7 * 3.5 * 1.3in Item weight: 170g / 6.0ounce Package size: 150 * 100 * 80mm / 5.9 * 3.9 * 3.1in Package weight: 300g / 10.6ounce Packing List: 1 * Air Detector 1 * USB Cable 1 * User Manual Shipping: 1.We guarantee to ship goods out within 24-72 hour after