Youshiko YC9510, Руководство по эксплуатации

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6.4 Barometric Pressure Display
6.4.1 Viewing Absolute vs. RelativePressure
To switch between absolute and relative pressure, press and hold the
[PRESSURE -] button for two seconds.
Absolute pressure is the measured atmospheric pressure, and is a function of
altitude, and to a lesser extent, changes in weather conditions.
Absolute pressure is not corrected to sea-level conditions.
Relative pressure is corrected to sea-level conditions.
For further discussion of relative pressure and calibration, reference Section
6.4.4.
6.4.2 Rate of Change of Pressure Graph
The rate of change of pressure graphic is shown to the left of the barometric
pressure and signifies the difference between the daily average pressure and
the 30 day average (in hPa).
Figure 17
6.4.3 Viewing Pressure History
Press the [PRESSURE -] button to view the 12 hour, 24 hour, 48 hour and
72 hour pressure average.