Quote Originally Posted by Dryfter View Post
So, in other words. I could get thermostat that only has one temp prob. And use that to control 6 different levels of 48" heat tape.

And once it all got heated up. it would be the correct temp.
Yes, as long as you use the same amount of tape on every shelf, and your soldering is all good. A weak solder join would cause the badly soldered tape to run cooler than the rest, which would be really bad if the probe was on the cooler tape. Check your work with a temp gun.