you're listing the Ser# of the vario, not the model #
MOST will use .45L (roughly pint size)
if it is standard linear scale it will be the .45L, other types Logarithmic
and fast rate vario's may use .9L and even a few 1.8L capacities.
the actual part # will be 5StV ______
see my website http://www.wingsandwheels.com/page19.htm with a link to
Winter Catalog http://www.winter-instruments.de/
look under products for Table variometers incl. easa Form One
http://www.winter-instruments.de/eng...belle_mit.html
best regards
Tim Mara
Please visit the Wings & Wheels website at www.wingsandwheels.com

wrote in message
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Anyone know what size flask is requied with this unit. I have one and
can not find specs on Winter's web site. Also, is the flask size
critical to the accuracy of the unit? Instrument is 57mm and +/- 10
knots. S Nr. 05493. Instrument was purchased by me second hand.