I'm going to add a 4th snake to my collection and now I need a thermostat. However, I dont know which one to get for my snake rack and how to use it. I saw the zilla temperature controller, but I dont know how it will control the temperature when it doesnt have a reading for the temperature. So I need help, which thermostat, that is cheap, is good to use for a snake rack and explain how to use it please.