So, there is a difference between a herpstat and a thermostat? Let's say a buy a herpstat from Spyder Robotics and I buy a ranco thermostat. I plug the thermostat in the herpstat and then i set the temp on the herpstat and it stays that temp? what about the probe? i hear that its supposed to determine multiple temps like a whole rack. How does it do that? Idk, im a little confused.. I'm probably thinking about this a little too much... :/