In article op.0fkjut2bwdg98l@glass,
Commander Kinsey wrote:
Why do barometers have different centre readings? I thought 1000 mbar was
average, as that's what barometers always used to have as the central
reading ("change"), but Wikipedia says it's 1013. I've seen some newer
ones with 1010 as the centre.

On mine it's 29.5 inches

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle