Features: 1. Programmable CO2 zone value and CO2 center value to control the on/off of output power.2. Equipped with 4.5M external CO2 sensor for use in enclosed spaces.3. Real-time display of CO2 value.4. Display CO2 chart with adjustable time scale (week/day/hour/minute/automatic).5. With CO2 concentration sound alarm function.6. Day/night automatic detection of built-in CO2 probe to cover CO2 control7. Backlight assists operation in dark places.8. The sensor probe cable is 4.5 meters long, which can extend the measuring point to 4.5 meters from the display.9. Install a 3kA@300VAC fuse in the instrument to avoid damage to the power supply due to overload. Specifications: