The specs of the probe are 2ºC up or down then there is 3º of hysteresis and on the top is still backlash. I would not recommend one for everyday use with out something accurate (1º+/-) to replace the readout. It is a silly side point to the OP problem unless there is one in a local store waiting days or weeks with snakes at 70º is unacceptable period. If a rheostat or any t-stat is available locally that can be picked up TODAY advising them to order something is plain irresponsible. Snakes cannot be with out heat for weeks at a time.
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