C.A.P. CO2-4e Hydroponic Climate Controller - Temp, Humidity, CO2, Exhaust

Description

Overview:
This is a full climate controller for hydroponic growing environments.  Coordinate your CO2 generators, inline exhaust blowers/ventilation, and maximum temperature/humidity in one place.  There is an option to attach a CO2 ppm meter, although it's not included.  CO2 ppm is easily calculated using just the cycle timer and controlling how much is released/generated.  This unit was only used for two 4mo growing seasons and then safely stored due to move, it was originally just over 0 when purchased and it's in great condition, it's a pretty good piece of hardware to have for a serious grower.  From my experience, these are less apt to break than anything digital, CAP's stuff always held up great for me.
Operation:
The unit will turn on the exhaust when the temperature/humidity reaches the limit, exhaust for the set cycle time, then turn on your CO2 for the set cycle time, and automatically exhaust if the temp limit isn't reached but the CO2 time limit is reached instead.  The capillary tube wound up on the side is your temperature probe, be sure not to kink it.  The black port on the bottom is where the CO2 ppm meter goes if you attach one.