Use this gauge to check flatness or gaps between mating parts. The holder contains 13 blades ranging from 0.05mm to 1.0mm, blade length is 100mm. Each blade has been hardened, tempered and polished. Clear etching of the nominal thickness on each blade makes for easy identification. To gauge intermediate thicknesses stack two or more blades together. When not in use, fold the blades back into the holder for safe keeping. Thicknesses are 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90 and 1.00mm.