On Feb 1, 9:05 am, "frederick ploegman" wrote:
"jim" wrote in message

...



On Jan 31, 11:18 pm, "frederick ploegman"
wrote:
"jim" wrote in message

...

On Jan 31, 5:54 pm, pp wrote:

Unless you are in the UK where triple scale hydrometers made after
1983 seem to feature a different version of PA to anyone elses heh
heh...

I think the only change was to the temp standard used for calibration.
I still have the older ones that used 60f as the standard. I think
most of the newer ones use 68f as the standard. The standard used
should be printed on the each hydrometer. Temp compensate and
you should end up with the same numbers.

That is a sensible deduction. However, the hydrometer one I inherited
from my father - which matched the scale commonly used in the US - was
calibrated to the same temperature as my current triple scale which
doesn't match any PA system anyone else seems to use

I am sure you are right in general though Frederick!

Jim

Hmmmm...The ones I have also state that they are specifically
designed for use in beer and winemaking. Yours ??

Yes they say "wine or beer" at the top of the hydrometer. Both were
made by Peter Stevenson Ltd (made in Scotland). Sadly I have broken
the one which used the same PA scale as the American system (and which
was made I think actually in 1976) The current model was copyrighted
in 1983 and is the same one I can still buy from my winemaking shop.
They were both made for beer and winemaking. Curious isn't it. I
once tested the PA scale of the two side by side and in some areas it
was wildly different. I think the differences are recorded somewhere
on the group though I can't find them at the moment.

Jim