IMG_2140_1.jpg
Sorry for the double post, this is the end of the wire that comes from the potentiometer, and ends up in the bath, near the heater-element. The other wire looks pretty much the same, but a rounder "tip" on the end...

It doesnt look much like a sensor :P Just a goey mess on the front, looks and feels like some glue. Is the sensor itself under the black covering plastic ? The wire is much more stiff the last 20cm or so.