What is “Sea Level Pressure”?
Sea Level Pressure is simply the air pressure for a specific
location adjusted to account for the air pressure difference
due to the altitude of the location. Because very few
places on the earth are actually at sea level, this adjust-
ment factor was devised to allow for easy comparison of
air pressure values from place to place. For example, with-
out this compensation, a pressure reading of 29.5 inHg in
Denver, CO would not mean the same as the same reading
in Miami, FL due to the large difference in altitude.
Meteorologists would have a very difficult time measuring
the change in the weather as fronts move across the land
masses if there was no way to compensate for the altitude
effects. So, whenever you see a barometer value published
online or in a newspaper, it is always the pressure adjust-
ed for the altitude of the measuring station.
to the section entitled “Notes on calibrating the Altimeter
and Barometer” on page 15 for general information regard-
ing calibration.
1. Press and hold SET until the word “SET” appears in the
lower line of the display.
2. Using START/SPLIT or STOP/RESET, adjust the
weather icons to the actual weather conditions.
3. Press MODE to move on to entering the sea level air
pressure.
4. Using START/SPLIT (to increase) and STOP/RESET
(to decrease), adjust flashing value.
5. Repeat steps 3 and 4 until for each flashing value until
the pressure is set as intended.
6. Press SET to complete calibration.
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