There seems to be a disconnect in the understanding of "barometric pressure". The pressure we all refer to when discussing the weather. This "pressure" is normalized to sea level. If you are not at sea level then you must add a correction factor to the air pressure that is measured.
If the Aranet4 is reading air pressure accuratly then an altitude correction must be done to give "barometric pressure". Without this correction the number on the app is the air pressure.
Using my iphone as a reference, both the iphone and the Aranet4 read within 0.06 in. of mercury air pressure. The iphone then corrects for the altitude of your location to give "barometric pressure", in good agreement with local weather stations. This is not possible with the Aranet4, so the number displayed is absolute "air pressure", uncorrected to give "barometric pressure".
If the app allowed the user to enter an altitude, then the pressure reading could be corrected.
