Barometer Calibration

[SWhits]

Just got the S20 and prior to this had iPhone. My wife suffers from menieres disease triggered by pressure changes to which we used a barometer app. I've tried a number of barometer apps and they are all reading 20 millibars less than current atmospheric pressure. Is there any way of calibrating the sensor?

 

[Rukbat]

Pressure can vary all over the place. If you can get to a weather bureau station, you should be able to calibrate to what they measure. (Running a 32 inch column of mercury would also do it, but that's expensive and a mess. A water barometer would have to be about 40 feet tall.)