4
GB
means the past pressure was higher than the present pressure
by 2 mb.
This gives you the pressure trend over the last 24 hours. The
weather will be getting better ( worse ) if this chart shows the
bar marks moving up ( down ) towards the present time
‘ 0H ‘.
BAR GRAPH PRESSURE TREND
Important:
It is only possible to measure the barometric pressure trend
properly if your barometer remains at the same altitude.
When moving around at different altitudes within a short
time period, the air pressure changes, the barometric pressure
change is not correct, until the barometer has remained at a
constant altitude for 24 hours.
However, please note again the accuracy of a weather forecast
based on the barometric pressure reading. It is considered to
be about 70-75%.
ABOUT THE ALTITUDE SETTING
1. For monitoring the local barometric pressure reading,
the user needs to select the 0 meter (preset value) for
the altitude setting.
2. For monitoring the Sea Level barometric pressure reading
at certain altitude, the user needs to select the local
altitude (-100 to 2500 meter) for the altitude setting.
HOW TO SET THE ALTITUDE
1. Press and hold the [ ALT ] button for 2 seconds to set
the altitude. The 'ALT ' indicator will turn on with the
altitude setting flashing (display in meter). Increase/
decrease the altitude in steps of 10 meter by pressing
[ ] or [ ] button. Press and hold [ ] or [ ] for
faster setting.
2. Press the [ ALT ] button again to set the altitude. At this
time the previous pressure display will reappear. If the
altitude has been changed, the ' ALT ' indicator flashing
(about 15 minutes) until a new sampling takes place and
the pressure reading is then compensated with the new
altitude.
