• Predict changing weather patterns using the PRO TREK's barometer. It takes readings every two hours and stores them automatically. It graphically displays the barometric pressure for the past 26 hours. The display ranges from 260 to 1,100 hPa/mb (7.65 to 32.45 inHg) with changeovers from hPa to inHg.

    Quick Facts:
    • In some areas, barometric pressure is epxressed in millibars (mb) instead of hecto-pascals (hPa). It really makes no difference, because 1hPa = 1mb.

    • You can select either (hPa) or inches Hg (inHg) as the display unit for the measured barometric pressure.