My digital thermometer probe is right next to the probe for the heating pad thermostat. Both under the hot side hide. Then I have the actual temp gage on the other side of the tank for the ambient temp. When I woke up this morning my thermoter for the hot side said 100 but the thermostat says 87. I immediately pulled my snake out and trying to figure out what's going on. I'll try to figure out how to attach pictures