The general purpose scale incorporates five different scales. One measures radii from 1/16" to 3/8" in 1/32" increments. The second measures angles in degree intervals over a 90 degree range. The third measures decimal fractions of an inch over a 0.500" range at 0.005" intervals. The fourth is a metric scale, 10mm long, engraved in 0.1mm intervals. The fifth contains three lines: 0.001", 0.002" and 0.003" wide, respectively.