LOL - VERY cleaver GG! Not only would MacGyver be impressed - you might also be able to get a part-time job in the IMF (Impossible Mission Force) lab! Or, maybe compete to replace Agent 99's spot as a smarter sidekick for CONTROL's top Agent 86?
Most candy/fry thermometers are "clip on". You can get these all kinds of places - KMart, Target (WalMart used to carry them - so did my Albertsons grocery store) ... to high-end places like Williams Sanoma, etc.
If you want to take your talents and transform that hack-saw blade to a thermometer clip - here's a picture ...