I'm pretty new to all this and find this discussion fascinating, but it brings up a question I've wondered about: I've heard of people using something like a Herpstat Pro to control the heat on 10 or more cages. How exactly would that work, since there's 4 probes on the box? I guess the broader question is, if I invest in something like a Herpstat Pro or other higher priced thermostat (Helix, Johnson, etc), would I be able to use it on more than one cage per output? That would definitely make the expense more palatable... Thx!!