That's interesting.

My question - and I am not an electrical engineer - is that if the probe is taped to the Flex, and the aluminum tape is conducting heat from the tape around the probe, and there is at least the slightest bit of heat lost to the air via the conduction through the tape, how would there be false high readings? Is it because the probe is surrounded by heat, whereas the surface of the flex is losing heat more quickly to the air?

I take my temps from the tub itself, though. The probe on the flexx is just to get the temps where they need to be. So if I get a false high reading of 92 on the flexwatt itself, but the hot spot inside my tubs are 85 - it doesn't really matter.