These should work for you. The laser simply indicates what it is you're measuring -- a pointer, that's all. The temp. reading is IR, I believe. I remember reading something about these being used in food prep, so I don't see why they wouldn't work. My plan is to check coolant temps at the radiator and thermostat housing to see how accurate my factory gauge is.

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)