Fangrui Product Details This Co2 Controller Measures Co2, Temperature, And Humidity Simultaneously. The Co2 Detector Has A Clear, Easy-to-read Display With Backlighting, And The Co2 Level Measurement Range Is 0~5000ppm. In Addition, This Co2 Sensor Is Equipped With A Display That Shows Co2 Readings For Easy Observation. Automatic Detection Of Day And Night: The Co2 Controller Contains A Photoelectric Sensor That Detects Day Or Night In Plant Mode And Adjusts The Co2 Level Accordingly. The Co2 Generator Can Be Turned Off At Night And Started During The Day Based On Light Levels And Co2 Levels. Dual Control Sockets: The Dual Control Sockets Allow You To Set Control Thresholds For Both The Fan And The Co2 Generator At The Same Time. Automatically Switch Between Gas Filling And Ventilation Based On The Set Range. The Cable Length Is 4.5 Meters, Allowing For Placement At A Distance Ndir Co2 Sensor: Using Advanced Non-dispersive Infrared (ndir) Technology, Co2 Can Be Accurately Measured With Minimal Drift. Dual Control Modes: The Co2