Quote:
Originally Posted by Chance
Almost any thermometer that is convenient to hold and read while in cold air stream (A/C discharge) will do the trick. Since you're only looking for a difference of about 15 degrees F or less, one that only goes up to about 120 F should work fine.
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Hit up a truckstop and grab a produce "pulp" thermometer, just stick the prod into the vent and they have a a shirt pocket clip..