Not thermometer probe, thermostat probe, the thing that. You prob. dont own a thermostat. check em out here www.spyderrobotics.com
Place the probe directly on the element, if you put it anywhere in your tank, and the waterbowl gets tipped over, you snake is gonnadie a horrible death and your house will catch on fire...
I cant believe to number of people that didnt choose directly on element in the pole.