The new APC8400 CO2 Monitor & Controller with Integrated Sensor offers a simple and affordable way to control, monitor, and record CO2 levels. Operation modes are CO2 enrichment or CO2 exhaust. The new CO2 Exhaust mode will trigger an exhaust fan to reduce CO2 levels. This is an ideal safety function for humans working in confined spaces. Trace your room's CO2 levels over minutes, hours, or up to 7 days with this easy-to-use controller. The APC8400 also boasts a fully customizable CO2 setpoint and deadband. Adjust and review your CO2 levels when you want and how you want. The APC8400's memory feature gives growers a real edge in fine-tuning the grow room environment. Optimize your indoor CO2 levels with this precision controller from Autopilot!