C.A.P. XGC-1 Xtreme Greenhouse Controller 

The XGC-1 is the best all-in-one controller ever made. It is identical to the CGC-1, except for the addition of Fuzzy Logic(tm) CO2 control! Fuzzy Logic(tm) gradually keeps the CO2 level at your desired setting, without going over the set point. 

The C.A.P. XGC-1 controls all of the main devices required in today's modern hydroponic garden. Your garden's HID lights are controlled by a precision 24-hour time clock. Two outlets are provided for your lights.

Supplemental CO2 and hydroponic pumps are coordinated with the time clock. 2 outlets on the XGC-1 are for your exhaust fans or air conditioner. A built-in thermostat and humistat handle the growing area's temperature and humidity control functions.

2 pump outlets allow your water pumps to be controlled by the built-in Adjustable Recycling Timer. A selector switch allows you to determine if the hydroponic pumps are to cycle only when the lights are ON or 24 hours a day.

An auxiliary NIGHT outlet activates when the lights are off - perfect for controlling humidity at night using dehumidifier or separate heater. Supplemental CO2 is coordinated in harmony with your exhaust fan's temp and humidity control functions.

More info from the Manufacturer (PDF format - Lots of detail.)