PPOR.

I walked into that one didn't I

Ok, is this level of geekiness proof?
This was my previous watch (the strap disintegrated but it still works), I had to re-solder the 5 connection wires between the infra-red themoscanner sensor (point the watch at something and it'll tell you the temperature) and the watch's circuitboard to fix it, each wire the thickness of a human hair:

Previous to that I had a thermometer watch and my current watch is a calculator/remote control.