Super handy, compact gauge quickly shows the thickness of your material in decimal inch, fractions, or millimeters. 0 to 1-1/6 range.This is one of the handiest gadgets Ive added to my shop in quite some time. The spring-loaded arms allow you to quickly and accurately gauge material thickness up to 1-1/16 as youre sorting lumber, thickness planing, etc. The compact size (the body is less than 2 across) neatly fits in an apron pocket so its always at hand, and its faster to operate that a set of calipers. And if youre not dragging your $100 calipers all over the shop, theres no chance of knocking those calipers onto the floor.Stout spring-loaded arms connect to a metal chassis with a plastic upper housing... this is a beefy little unit, built much more heavily than you might expect. Measures in decimal inch to 0.001, fractions to 1/64, and millimeters to 0.02mm.