the probes are what go from the thermostat to wherever you are going to measure the temp, the probes are the actual thermometer part of the thermostat (or at least the sensing part)

Anyone know of a good unit that will control temps and humidity. It would be nice to have it all in one.... ive seen this one (http://www.reptilesupply.com/product...oducts_id=2472) but is it any good?