In the old tank, the temp. was at 80 in the middle part of the tank. At the bottom of the new one, it's reading 70 degrees. Should I move my thermometer up a bit and see where it's at near the top? Or should it be okay how it is?

Which humidity gauge is the best? I have an Exo-Terra one at the moment, but I'm looking at a combo thermometer/humidity gauge.