Autopilot CUMULUS S50 Digital CO2 ControllerThe Autopilot Cumulus S50 Digital CO2 Controller measures and controls grow room carbon dioxide levels with great precision. It can operate in Fuzzy Logic mode, ppm Up or ppm Down mode. The S50 digital display shows exact ppm readings down to 1 ppm resolution. It boasts a fully customizable CO2 set point and deadband, min max recall, LED mode and error indicators, optional calibration and a remote 15' low drift CO2 sensor with photocell. The ppm Up