The Specto length gauges set new standards for size and mechanical durability and are especially useful for process monitoring and quality control applications. Besides providing an accuracy of ±1 µm, these incremental length gauges have measuring ranges of 12 and 30 mm (0.47 and 1.2 in.) and, in the current version, provide a reference mark. The mechanical design of the gauges respects the high dynamic requirements of in-process gaging and quality control. For example, the length gauges are designed for plunger velocities up to 1.2 m/s (47 ipm). All versions feature a ball-bush guided plunger and a high degree of protection against contamination. There are also versions available for pneumatic plunger extension.