This is a kind of quality air quality detector which uses high accuracy semiconductor sensors with stable working performance. Large digital display 3in1 design you can see the carbon dioxide concentration real time and humidity data clearly. Widely applications: agricultural planting greenhouse vegetables production warehouse material processing home interior etc.. You can have a try. Features: Uses high accuracy semiconductor sensors with stable working performance can accurately detect carbon dioxide value. Adopts air convection design which can provides more accurate detection results and the detection ranges from 400ppm to 5000ppm. Large LCD display 3in1 design you can see the carbon dioxide concentration real time and humidity data clearly. 4-color color-circle design different font colors display different air quality green 0-799ppm green 800-1199ppm orange 1200-1599ppm red 1600-1999ppm 2000ppm above four colors flash at the same time. Strong -interference ability low consumption and long service life. The product does not need calibration it can be tested after booting and it can accurately detect carbon dioxide. Hundreds of ventilation holes reserved on the housing not only accelerate the convection between the air and the machine thereby realizing effective detection but also provide a fine heat dissipation effect. Widely applications: agricultural planting greenhouse vegetables production warehouse material processing home interior etc.. 1200mAh large capacity battery for long working time Type-C recharging interface easy recharging. Specifications: Name: Air Quality Analyzer Color: black white (optional) Display: LCD+backlight Battery: 1 * 3.7V 1200mAh battery (included) CO2 measuring ranges: 400-5000ppm Resolution: 1ppm measuring ranges: 0-50℃ Resolution: ±1℃ Humidity measuring ranges: 0％-99％RH Resolution: ±5%RH Operating : 0-70℃ Input voltage: 5V Recharging interface: Type-C Item size: 90 * 70 * 35mm / 3.5 * 2.8 * 1.4in Item weight: 117g / 4.1ounce Package size: 140 * 125 * 41mm / 5.5 * 4.9 * 1.6in Package weight: 173g / 6.1ounce Packing List: 1 * Air Quality Analyzer 1 * Type-C Cable 1 * User Manual