What you should get is a good point-and-click IR thermometer. The reason people are asking about the UTH and thermostats is because the UTHs often run too high--like 120F, instead of 90F. A good way of controlling that on the cheap is to buy a table-top lamp dimmer (for sale at home depot in the lighting section) and play with it until you can get a nice regular 95F out of your hot spot.
And if you can get that under control, the heat lamp is probably redundant. (unless you live in a cold, drafty house in the winter.) UTHs (when not too hot) are better than heat lamps for controlling humidity--a heat lamp will bake it right out of the tank.
But actually your humidity sounds excellent, what with your spraying.(I live in Phoenix, and can only envy a low of 50% humidity.) A mister is generally overkill for a ball--if you get a rainbow boa or any kind of tropical tree snake, THEN you'll want one.
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