🌍 Breathe Easy, Live Smart! Calibrate CO2 levels with high/low concentration alarms for peace of mind. Plug-n-Play setup with dual display windows for effortless monitoring. Perfect for schools, offices, factories, and more—wherever air quality matters. Simultaneously control CO2 regulator and exhaust fan for optimal air quality. Sensitive NDIR sensor measures CO2, temperature, and humidity with ease. 100-240V, 10A max 0-9999 ppm range 0-50°C temp range The Inkbird Digital CO2 Controller is a state-of-the-art monitoring device designed for precise control of carbon dioxide levels in various environments. Featuring a sensitive NDIR CO2 sensor, it measures CO2 concentrations from 0-9999 ppm, temperature from 0℃ to 50℃, and humidity levels up to 95% RH. With dual relay functionality, it can manage both CO2 regulators and exhaust fans simultaneously, making it ideal for HVAC systems in schools, offices, and other high-traffic areas.