Bah tstat

[sicilian1928]

I have a bah 1000 tstat hooked up to my uth and i have it set to 91 degrees. I also have an acurite thermometer w/ probe to measure the hot and cool side + humidity. So if the tstat is supposed to heat until 91 degrees and then shut off then work itself back up to 91, why is my thermometer saying its at 96 right now???? I have both probes right over the uth (hot glued over uth, buried by substrate). How is this happening?

[DZ Reptiles]

How thick is your substrate? The thick substrate over the UTH and probe can cause a raise in temps

[sicilian1928]

How thick is your substrate? The thick substrate over the UTH and probe can cause a raise in temps

Its about an inch thick. So do you think that the temps are actually lower than that? but the thermometer is just being affected by the substrate?