infrared thermometer is what you were thinking, i picked up the harbor freight one years ago (yes it still works) and it has a laser pointer that is fun to play with and it reads within about 5 deg depending. IR thermometers don't like shiny or transparent materials tho. tried to measure the temp of a chromed friction roller at work and i know it it was second degree burns hot but gun said it was 81 degrees (the $750 company one said it was 83.6) and it only cost me $35 on sale.
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