Tim I have one a guy gave to me yrs. ago, it's for meas. temp's for Restaurant use, only goes to 5-600 deg. F. Look for one that can go up to 1000 deg. F.
here ya go: Harbor Freight. MAybe there's a cheaper one, dunno. Online Manual says this one goes to 968 deg. F.
Gadgetman use this to check ex. man. temps before/after Groove job. All kinda useful for Mechanic work, check radiator temps, if an exhaust man. port is cooler than others to diagnose how cylinder is running, etc. etc.
Once ya have one, you'll find uses, believe me!