Large LCD screen, you can clearly see the amount of electricity, CO2 value, TVOC value, HCHO value, temperature and humidity. and switchable, with stable detection performance, anti-jamming ability, low consumption and long service life. Equipped with air quality level dividing function, four different colors correspond to different levels air quality, letting you know the current atmospheric conditions more accurately and graphically. Widely applications: agricultural planting, greenhouse vegetables, production warehouse, material processing, home interior, business offices, etc. Note: The product error range: 10-60PPM. After the product is turned on, it should stand for 4 hours to make the measured value more accurate.