I will grab a thermometer but given the fact that its only 80 degrees here I feel I should be able to tell a 10 degree jump with sensitive skin. The thermostat probe is taped to the outside of the heat tape.
i actually finished wiring up some flexwatt yesterday and ran it for a couple hours because i didnt believe it would be that cold when i touched it... i used a temp gun and it read 110 in the tub... lol so yea use a temp gun