Great question. I tried an infrared laser thermometer. Its so inaccurate thats its useless. Been wondering how the a/c guys do it. My buddy went to hvac school, and recommend thermocouple for the dmm. But tight vehicle constraints make them difficult to fit properly.

Has anyone tried this?

http://www.fluke.com/fluke/inen/accessories/Temperature/80T-150UA.htm?PID=55383

Or is multiple channels really necessary?

Kevin Mowdy
Technician
USMC-Exercise Support Division
Yucca Valley, California, USA