La Crosse Technology Wireless 433 MHz Weather Station with Sun/Moon Time WS-8015U Instruction Manual page 15

F. Weather measurement units (°F/°C, inHg/hPa)
1. Press and hold the "SET" button for 1 second.
2. Press and release the "SET" button 11 times.
3. The selected temperature units will now flash (°F default/factory
setting).
4. Press and release the "+"or "–" button to select °F (Fahrenheit) or
°C (Celsius).
5. Press and release the "SET" button to advance to the barometric
air pressure units setting.
6. The selected air pressure units will now flash (inHg default/factory
setting).
7. Press and release the "+"or "–" button to select inHg (inches of
Mercury) or hPa (hectopascal or millibars).
8. Press and release the "SET" button to advance to the barometric
air pressure calibration setting.
9. The air pressure reading will now flash (29.91 inHg, 1012.8 hPa as
default).
10. Press and release the "+"or "–" button to adjust to the correct
relative air pressure based on local reports.
11. Press and release the "SET" button to advance to the forecast
sensitivity setting.
Note: Barometric air pressure is usually reported as "relative air
pressure". This reading is based on the combination of absolute air
pressure and altitude. In general, an increase in altitude will result in a
decrease in air pressure. Relative air pressure will make readings in
nearby locations relative to each other to allow for proper forecasting.
The absolute air pressure reading in the Weather Center cannot be
calibrated, only the relative air pressure.
12. The selected forecast sensitivity setting will now flash (0.09 inHg
default).
13. Press and release the "+"or "–" button to select 0.06, 0.09, or 0.12
inHg (if hPa is selected, the choices will be 2, 3, or 4). A lower
setting will result in a quicker change in the forecast icon. In other
words, if the setting is 0.06 inHg, the forecast icon will change if
the air pressure changes by at least 0.06 inHg within a six-hour
period. This is useful, as certain areas will have a change of air
pressure but no change in weather.
14. Press and release the "SET" button to advance to the storm
warning setting.
15. The selected storm warning level will now flash (0.15 inHg, 5 hPa
default).
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