In article , Peter R.
writes:

I brought it
home to calibrate it and found that it read 2 deg high at 25, 45, and 65
deg.

How did you calibrate your thermometer for 25 degrees?


I put it and two reference thermometers in the freezer part of the
refrigerator. I put them in the full freezer that is about 0 deg F and the
digital did not display. Don't know if the battery was weak or the electronics
just gave out. I didn't think that this was a problem since the inside of the
plane is at least 25deg F G or higher. The 45 deg was the refrigerator and
the 65 was outside temperature.

Chuck