The LDS-3000 Laser Doppler Scale from Optodyne offers 2.5-nm resolution, a speed of 12 in./s and a 2000-in. maximum range. The device is designed for indicating position in single and multiple axes applications. A modulated laser beam is reflected off a moving target to provide displacement information used by the system controller to calculate position. Installation involves aligning the laser head assembly with the retroreflector. The plug-in board fits into a PC ISA Bus slot.