J.DISPLAYING RELATIVE hPa/inHg OR ABSOLUTE hPa/inHg
Note: Air pressure on this unit can be displayed in four different
measures: Relative hPa, Absolute hPa, Relative inHg, and Absolute inHg. The Absolute setting gives a true and real-time air pressure reading (at the users location) that cannot be manually calibrated. However the Relative air pressure setting must be manually programmed to suit the users needs. Relative air pressure is measure in relation to sea level and is the standard form of measure. You can retrieve the Relative air pressure from your local weather service. Absolute air pressure decreases by about .01 inHg for every 10 feet in altitude. In higher altitudes (above 6,500 feet) this effect is less noticeable. The WS-7059SU will measure absolute pressure reliably up to 7,500 feet. There is no limit for relative air pressure since the user sets it. Most weather reports and radio reports use relative inHg.
1.“rel inHg” will flash in the pressure LCD.
2.Press and release the “CH/+” button to toggle through the Absolute and Relative options until you reach the desired setting.
3.Press and release the “MODE/SET” button to confirm and advance to the manual setting of the Relative air pressure.