Arduino modder Matthew Garten took his previous watch, a stingray hide "Biopunk Edition," and wrapped it with pseudo steampunk. It's an acquired taste, to be sure, but a temperature-sensing watch is handy if you're dealing with heat (or steam!).
There's also a range-finding feature, Breakout, a trackball and a 128x128 OLED display. The whole kit, a DIY project if we've ever seen one, runs about $250.
The temp-sensing functionality can be seen in Garten's Biopunk watch. And yes, he's got a sword at his hip: