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I found the source of the precision level vials;
http://wamoyer.com/
W.A. Moyer Company - Spirit Level Vials
wamoyer.com
over the years, the w.a. moyer name has become synonymous with the ultimate in quality in the manufacture of tubular glass level vials. continuous research provides ...
Moyer quotes a typical sensitivity of 30 min. of arc for their vials. This works out to about .1"/ft. A machinist's level will have a sensitivity of .005"/ft. and .0005"/ft. for the more sensitive levels.