who thing Stephen Hawking is a cosmetologist
I can't believe no one has mentioned this yet. Get an infrared thermometer ( they usually shine a laser spot on whatever it is that you are trying to measure).
Very good for finding hot spots in racks, also tells thou how hot your coffee is with out having to sip it and burn your mouth.
At the source of every error which is blamed on the computer you will find at least two human errors, including the error of blaming it on the computer.