Equipped with a quality temperature sensor and humidity sensor for fast and accurate detections. The 2.8-inch LCD screen with backlight can clearly display the current CO2, temperature, and humidity values. The colored circle will change according to the current CO2 value. Easy to use, no need to calibrate after startup, it can work and detect automatically. Supports 240-360 minutes of standby time. Compact size and light weight, portable and convenient to use and carry. Widely applied to household use, educational institutions, agricultural cultivation, greenhouse planting, warehouse operation, material processing, etc.