For measuring projectorsThese standard overlay charts increase the range of application and the efficiency of Mitutoyo profile projectors.This chart set offers you the following benefits: - The charts are supplied in sizes ø250, 300, 340, 500 to suit the screens of Mitutoyo projectors. - A large range of scales and profiles is provided that enables you to test workpiece features quickly and easily. You can test length, height, parallelism, angle, radius, taper, bore position, diameter,as well as all standardized thread and tooth profiles.- All charts are made of a distortion-free special plastics compound and are provided with a protective coating. Old No. 20..../51.... are discontinued but you can order it with the New No. 63AAA.... if it is not in the list we create it for you.