"Stormin Mormon" wrote in message
...
Make ice cubes out of distilled water. Make a mixture of ice cubes and
distilled liquid water, and shake it up good. When you're sure it's all
32F,
soak the thermometers. the one which reads 32F is correct. The others are
not.

Only an engineer could spend so much time on two degrees.

And even by doing all that you are only sure of one point. It could still
be way off at 70 deg.

He should just put a piece of tape over the readout and set it to the
comfort zone.