The thermostat probe could get peed or pooped on, moved by the snake, etc. inside the tank. If that happens and the apparent temperature of the probe drops, the UTH will be run without limit.
You rely on the thermometer probe (at times when you know it hasn't gone through the above) to see what temperature it is inside where the snake can get. Then you set the thermostat/UTH to whatever is necessary to reach the desired temperature INSIDE. It'll probably be a few degrees off. That seems to be what happens, anyway.
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