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Autopilot PPM-5 CO2 Controller air-purification which can lead to rootThe Autopilot PPM 5 CO2 Controller is a simple and affordable way to control your CO2 injection device. Choose your desired CO2 parts per million (PPM) level, and the controller will automatically maintain that specified CO2 level. A built in photocell located on the right side of the sensor automatically deactivates CO2 injection during the night time, and the unit's digital display shows live CO2 levels. The display is green in color, which will not