Man that is awesome.I have two of those thermometers from autozone and they both read two different temps. one will say as low as 25 degrees while the other one will get to 40 at the best. Im glad to see that they can be calibrated because i dont want to buy an infared thermometer. As for a/c knowledge, and all car and mercedes knowledge, i am like a sponge soaking up info and I have wanted to buy a book on a/c. I recently got my 609 cert so i could buy r-12 and stay away from those r-134a dummy kits. So by the way is just above 32 degrees as cold as an a/c system can get without freezing up? Would that translate to vent temps of 33 degrees the maximum any car can blow out? Sorry for asking so many questions.and thanks for your answers

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual