On Tue, 30 Jun 2020 19:11:11 +0200, "R.Wieser" 
declaimed the following:

>Is the sensor supposed to be able to give that different results (internet
>shows 1008, 1009 hPa around my position, the sensor shows 1000.47) ?    I
>thought that the calibration process and resulting data would not allow for
>it ?    What might be causing it ?

 I believe weather reports (I presume that is what you are looking up)
report sea level equivalent pressure. Have you compensated for your
altitude?

 Standard (not accounting for weather) sea level pressure is 29.92 inHg
or 1013 mbar/hPa. 500 ft (153m) above sea level, the measured pressure
would be 29.38 inHg or 995 mbar. I'm sure it is not a linear equation
(https://www.sablesys.com/support/technical-library/barometric-pressure-vs-alti
tude-table/)
but for the first difference, that is coming out to 8.5 m/mbar (or 27.8
ft/mbar). You are stating an 8 mbar difference, which would correspond to
an altitude of 68m (222 ft) above sea level.



{Strange -- Topo map shows my house at 650ft, calibrating my GPS altimeter
for 650ft gives barometer 29.94 -- but setting my analog altimeters for
29.94 is showing altitude of 725ft. I suspect it is lack of temperature
compensation -- the analog altimeters were consumer grade: Thommen Altitrek
and Sun Altimeter 203... A few years ago I looked for the pro-grade
Thommen, but all Thommen units had been discontinued. The pro-grade version
included thermal compensation}



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