Davis Instruments Vantage VUE Quick Reference Manual page 12

Barometer
Press BAR to select:
 Barometric Pressure
Press 2ND and UNITS to change unit of measure
There are four units of measure for barometric pressure: 0.00 in, 0.0 mm, 0.0
hPa, and 0.0 mb.
Barometric Trend Arrow shows change over the last three hours:
Increase of 0.06" Hg (2.0 hPa or mb, 1.5 mm Hg) or more.
Increase of 0.02" Hg (0.7 hPa or mb, 0.5 mm Hg) or more.
Change of less than 0.02" Hg (0.7 hPa or mb, 0.5 mm Hg).
Decrease of 0.02" Hg (0.7 hPa or mb, 0.5 mm Hg) or more.
Decrease of 0.06" Hg (2.0 hPa or mb, 1.5 mm Hg) or more.
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