The optional CO2 Sensor (MBS-S8) measures the CO2 PPM within the growing area. Using the MBS-S8 allows the users to connect and control their supplemental CO2 system using the Hydro-X. *Used in combination with one or more DSC-1 CO2 device modules.
 
  "Sensors should remain dry and clean to prevent premature failure. Do not spray foreign substances or allow water / condensate on the sensors"