It depends on how the tape runs. For back heat I insert the probe so that it would be near the bottom of a tub. For belly heat the probe goes under the tape on a shelf, close to one of the side walls so the tub can slide in and out without running over it.
BTW if you're not registered on VAHerps.com yet, join, and ask for help there if you can't figure this out. There are quite a few members in your area.
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