Oh... I got so wrapped up in the piggie talk that I forgot to look.
Wow, these look like the solution to a number of problems. When baking bread in the winter I've used electric heating pads (the kind found at the local pharmacy) for years to keep the dough rising bowl warm. But they have only three positions: warm, hot, off. I've also used the heating pad to warm up clock/watch cleaning solutions. The problem with a medical heating pad is the cloth covering... in addition to the coarse heating control.
This is a much more elegant solution where more precise temp control and water-proof equipment is needed. Good find, Murray!