Features: Strong anti-interference ability, low consumption and long service life. The product does-not need calibration, it can-be measured immediately when it is turned on, and it can accurately detect carbon dioxide. Different-colors correspond to different air-quality, suitable for offices, homes and other-occasions. Hundreds of ventilation holes on the back of the chassis-can not only accelerate the-convection between the air and the-machine for effective detection, but also provide good heat dissipation. Widely used in: agricultural-planting, greenhouse-vegetables, production warehouse, material processing, home interior. Specifications: Material:ABS Size:As Picture Shown Package Includes: 1 Set Air-Quality Monitor note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.