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In the Pressure Difference Measurement sub mode (Fig. 27):
Field 1 displays the change in temperature.
Field 2 displays the change in atmospheric pressure.
Field 3 displays the current time; to the left of the time is the text differ.
The Outer Circumference graphically displays the change in pressure where one full circle equals 100 mbars
or 1 inHg.
This sub mode does continue in the background and allows the user to move to other modes and at the users
convenience can return to this sub mode to show the current reading.
5.1.1 How to Start the Pressure Difference Measurement
1. PRESS the [Select] button and hold in for 2 seconds. Located in Field 1 is the text SET; located in Field 2,
zero will begin to flash (Fig. 28).
2. PRESS the [Mode] button to accept the flashing zero and start the difference measurement.
If the user does not desire to begin the difference measurement, PRESS either the [+] or the [-] button to toggle
to the current barometric pressure reading, then PRESS the [Mode] button to exit the setup program.
Note: If the user does not press any button for 1 minute in the setup mode, the display will automatically exit
setup.
5.2 4-DAY MEMORY SUB MODE
In the Barometer mode, PRESS the [Select] button twice to enter this sub mode. This sub mode allows the user
to follow changes in pressure that will assist forecasting changes in weather condition (i.e. storms).
In the 4-day memory sub mode (Fig. 29):
Field 1 displays the day of the week the user is in;
Field 2 displays the atmospheric pressure; and
Field 3 displays the time and to the left the text memory.
The Outer Circumference graphically displays the atmospheric pressure where one full circle equals
100 mbars or 1 inHg.