Pro-Leaf CO2 ControllerThe Pro Leaf CO2 Controller is an accurate and versatile way to control CO2. Simply set the desired CO2 level for the time of day, and the Pro Leaf CO2 Controller will maintain that level. Day & Night mode, detected via a light sensor Accurate infrared CO2 sensor Large digital display to check CO2 levels and set point Accurate, self calibrated sensor Bandwidth setting ensures the unit will not switch on and off too quickly Fuzzy logic to prevent