The Shinwa 6 x 12 in Square is a polished stainless steel square with imperial graduations: 1/16 in on the 12 in leg and 1/32 in on the 6 in leg.
The legs are 0.600 in wide and 0.043 in thick, and the photo etched, black-filled graduations don't wear off the way printed ones do. It meets the JIS standard of 0.004 in per 3.937 in, and we measured ours within 0.002 in over the 12 in side. At this price, it's worth having one at the bench and one in the site box.
Shinwa Rules was formed in 1971 from three measuring instrument makers and is based in Tsubame and Sanjo, in Japan's Niigata Prefecture. In 1977 it received its first patent, for technology to mass-produce calibrated stainless steel rules of stable quality, and it describes itself today as a top-selling maker of metal rules in Japan.