Feature: 1. Multifunctional: This wall mounted CO2 monitor not only monitors current CO2 levels but also controls carbon dioxide concentrations in the environment. It accurately detects CO2 levels, temperature, and humidity, with a measurement range of 0 to 9999 ppm, ensuring optimal conditions for both plants and individuals. 2. Large Color Display: Featuring a 3.8 inch vibrant color screen, the CO2 air quality monitor provides real time readings of current CO2, temperature, and humidity levels. Users can easily switch between Human Mode for occupancy monitoring and Plant Mode for farm applications, tailoring the settings based on specific needs. 3. Automated Control: The CO2 controller is designed with a factory mode that automatically manages CO2 levels. When concentrations exceed preset thresholds, the relay output will turn off. Once CO2 levels fall back to the designated low point, the relay reengages, making it suitable for greenhouses, hydroponics, and mushroom farming to maintain optimal growing conditions. 4. Smart Ventilation: In manual mode, if CO2 levels surpass set values, the digital CO2 controller will activate ventilation fans automatically while emitting audible and visual reminding. This feature is crucial for ensuring air quality in enclosed spaces such as offices, schools, and commercial buildings, helping to create healthier environments. 5. High Accuracy Split Probe Sensor: The CO2 monitor tester and controller come equipped with a highly sensitive external probe sensor, designed for rapid and accurate measurement of carbon dioxide concentrations. This split probe technology allows for flexible placement, ensuring that readings reflect accurate air quality in various settings, enhancing user confidence in the data collected. Specification: Item Type: CO2 Controller Material: ABS Measurement Range: 0-9999ppm Resolution: 1ppm Measurement Accuracy: ±50ppm, reading ±5% Repeatability: 10ppm Temperature Influence: ±0.1% or ±2ppm per degree Pressure Compensation: Supported Calibration Mode: Supported Response Time: