"'Tomasz Lewicki' via weewx-user" <[email protected]> writes:

> It seems you didn't understand what I wrote: "I have two (WH25A and WN32P), 
> and each shows a different value. Their readings differ by exactly 10 hPa". 
> WH25A shows 969,7 hPa, WN32P shows 979,8 hPa. So it's 10 hPa. Correction +6 
> hPa is needed for WH25A which I use with my station. For WN32P correction 
> is -4 hPa.

I see - comparing 3 things.   In theory, all station pressure.   That is
still a very large error.   With one weather station and various BME280
type sensors (or DPS310), I think I'm seeing a peak-peak range of about
3 hPa.

>> I suggest reading the source code. Also, in weewx.conf, services are

> So should I set correction for pressure (ABS) only *and* pressure = 
> prefer_hardware to get pressure reported by console corrected by +6 hPa? if 
> yes, what to do next to have barometer (REL) also corrected, ie. near to 
> METAR value?

You should understand, of your hardware, which values are reported to
weewx, and which weewx is calculating.  Then how to address calibration
will very likely be clearer.

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