Features:  Uses high accuracy 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-range is from 400ppm to 5000ppm.  Large digital display, you can see the carbon dioxide concentration, date, time, temperature and humidity data clearly.  Strong anti-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..    Specifications:  Name: Air Quality Detector  Material: ABS  Battery: 1 * 3.7V, 1200mAh battery (included)  Display: digital display  Detection ranges: 400-5000ppm  Item size: 100 * 93 * 40mm / 3.94 * 3.66 * 1.57in  Package size: 170 * 160 * 60mm / 6.69 * 6.30 * 2.36in  Package weight: 500g / 1.10lb    Packing List:  1 * Air Quality Detector  1 * User Manual