From Ken Lawrence:
The most accurate gauge was manufactured by the Buildings Study Group
of the Germany Philatelic Society. It is printed on dimensionally stable
flexible film recommended by Eastman Kodak Company for this purpose, with
its scale from gauge 8.75 to 16.25 running the eight and a half inches of
the instrument, reading to an accuracy of 0.2 percent error at gauge 10,
roughly double the accuracy of the Linn's product.
Our committee selected the BSG gauge as our standard, and purchased a
quantity for BIA members. When the original printing sold out, Tony Torres
who created it could not find an affordable way to reprint it, nor could
I. At first I hoped the APS could do it, and then tried all the various
manufacturers of stamp supplies and big dealers, but struck out.
