In an earlier contribution to this discussion,
Roger wrote:


I am currently on the lookout for a cheap manometer but so far all I
have found are expensive digital types.

Any pointers would be appreciated (and no I don't want to make one
from scratch).

Why ever not? This *is* uk-d-i-y!

I made one years ago by bending some clear plastic tube into e U shape, and
fixing it onto a piece of floorboard, with a sheet of graph paper behind it.
I think I've still got it somehere!
--
Cheers,
Roger
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