The HEIDENHAIN-METRO MT 1281MW length gauge is particularly suited for such demanding measuring tasks. For measurements with a gauging force of nearly 0 (0.01 N to 0.07 N), it includes a specially paired insert with an exchangeable measuring pin. These extremely low values over a measuring range of 12 mm are also possible thanks to the ball-bush guide with very constant friction conditions and the constantly improving measuring force over the course of five million measuring cycles.