Saw this on the JEGS site and figured I'd throw up a Cool/Fool poll for it: http://www.jegs.com/p/Mr.+Gasket/874786/10002/-1 VOTE NOW!
Hmmm, I think it might be handy if you worked in a shop and wanted to check what temp t-stats opened at. If you're worried about burning yourself then a color change circle would do better. Red - hot, not red - not hot.