Where can i purchase a thermometer for my ball python tank.I am looking for the one that can measure temperature, humidity, and I want it to have the probe (for exact readings) I have heard that it is possible to get them at walmart or similar type stores. Can anyone give me a more specific way of finding them ie, a name of the thermometer/hygrometer, what store, and possibly what section of the store. I have been looking online and found a few that may be what I'm looking for but I am confused because it says the product is for cooking use. PLZ HELP.! I feel as if my snakes tank is too cold.