Model LF series linear scales from HEIDENHAIN Corp. (Schaumburg, IL) are used on highaccuracy machine tools, jig bore and grinding machines, and linear motors. The LF 485 and 185 incremental models feature very high repeatability and defined thermal expansion behavior. From a grating period of 8 μm, the interferential scanning principle of the LF scales produces scanning signals with a signal period of 4 μm. These scanning signals are largely free of harmonics and can be interpolated. Accuracy grades to ±2 μm are possible. The scales also offer resistance to contamination through the use of SUPRADUR steel scale tape together with a scanning ASIC with large scanning window.