Craig, pretty much hit it. The only thing I would add is that you take the temp on the surface of the glass, not above the substrate. He is also the "Tank" guy. Tubs are easier, tanks are prettier but a little more work. I am a small breeder with a lot of animals, so my outlook is different. Tanks are not an option for me. Way too many animals and they have to be in racks. I don't have humidity issues because of the tubs and the fact that I live in Florida, so I never have had to measure it so what people are using for that purpose I don't know. The heat gun on the other hand is very helpful to have and they only cost a couple bucks.
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lol