CO2 monitor can quickly and accurately detect the CO2 concentration indoor. In addition to CO2, the high-precision thermometer and hygrometer can also be used to monitor temperature and humidity in real time. In winter, metal CO2 detector is an indispensable device or office. This air quality monitor with non-dispersive infrared technology (NDIR), with five air inlet holes full temperature range correction, high measurement accuracy, fast response(1.5S detection once), resolution up to 1 ppm, measuring range up to 400 to 5000 ppm. This carbon dioxide detector is designed with 3 of CO2 concentration-good stage (400-1000 ppm), warning stage (1000-2000 ppm), and dangerous stage (2000-5000 ppm). It will alarm you when the detected CO2 concentration is beyond the value you customized. Remind you to open or turn on your air purifier to keep the air balanced. To the accuracy of measurement, this CO2 monitor supports the calibration function. Long press "" button 8S in an open environment and let it stand for 1-2mins to calibrate this CO2 meter easily. NOTE: Don't turn off the device during the calibration process! This high quality CO2 detector case is wrapped in zinc alloy for a refined appearance and simple design. Compared with the CO2 detector with plastic case, it greatly improves the service life and safety. This portable CO2 detector has an amazing compact body of 5.1x2.4x1.5 inch. You can easily carry it anywhere you want to go. Because of the LED energy-saving screen, it can be used continuously for 14 hours (5 hours at the highest brightness). With the upgraded Type-C port, it can be quickly fully in 1.5 hours. This air quality monitor indoor is perfect if you are near a wildfire - or if you depend on old or wood powered appliances in your home. It can quickly let you know the CO2 concentration of your environment. It also detects gas and air pollution in bedrooms, kitchens, offices, schools, cars, cellars, grow rooms, camping, parties and other places, always protecting you and your family in healthy air conditions. Colour:As Shown Material:Metal Package Contents: 1 x co2 detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.