Module No. 5678
Checking the Change in Barometric Pressure between Two Readings
When you perform the procedure below in the Barometer Mode, the second hand indicates the difference between the current barometric pressure measurement and the last auto measurement value (taken at two-hour intervals).
Enter the Barometer Mode.
The second hand indicates the barometric pressure differential (Pressure Differential Indicator).
Example: Barometric pressure differential of -3 hPa (approximately -0.9 inHg)
You can toggle between the two second hand functions by pressing (D).
The second hand points to [OVER] if the current barometric pressure differential is greater than +10 hPa (0.3 inHg), or [UNDER] if it is less than -10 hPa (-0.3 inHg).
A reading that is outside the allowable measurement range of 260 hPa to 1,100 hPa (7.65 inHg to 32.45 inHg), or any measurement error will cause the second hand to move to 9 o’clock.