Weems and Plath Endurance II 135 Barometer/Thermometer - Manual (Page 12)

Your barometer can be mounted indoors or outdoors as the pressure will
be the same in either location. At sea level, the normal atmospheric pressure
is about 30 inches, very rarely will the needle ever exceed 30.5 or drop below
29.5. Sometimes it is possible for the pressure to change only one or two tenths
of one inch over a week. Even a storm may cause only a half inch change. The
words Rain, Change, and Fair are on the barometer dial as a traditional graphic
decoration, not to be used as a weather predictor.
Barometer Specifications
The barometer measures atmospheric pressure in kPa/inch Hg or hPa/mm Hg
Measurement range: 940-1060Pa
Precision: 990-1030 hPa:+/-3hPa
960-990 hPa/1030-1060 hPa:+/-5hPa
Barometer Troubleshooting
Barometer needle does not move:
A. Often barometric pressure remains
steady for extended periods of time. Watch
for a few days to see if any changes occur.
B. If no changes occur after one week, then
do the following test: Place the barometer
in a clear plastic bag. Hold the opening of
the bag closed tightly to trap the air inside.
Push on the bag to create air pressure
which should cause the needle to move.
C. If the needle does not move after trying A & B, call Customer Service 1-800-638-0428.
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