What is the HIGHEST temperature that a probe will read if my bp is curled up directly on top of it?

Herpstat II is the thermostat I use & there are uths on each side of a 40 gal, paper-toweling & reptile bark is my substrate. Probe is located under each hide on top of the substrate & under the bp in this case.

p.s. Cold is set at 84/Hot is set at 94 but sometimes it reads ridiculously high & that is why I am posting this question, Thank You