Velmex Inc. has launched a line of UniSlide assemblies with optical encoders suitable for positioning fixtures for gauging, testing and alignment. The encoders offer 0.0005-, 0.0001- or 0.000005-in. resolution. The LED digital readout uses an RS-232C interface, a zero reset button and an inch/metric toggle switch. The stages are available in 2.5-, 4-, 6- and 9-in. cross-sectional widths for loads up to 300 lb. Many Uni-Slide models have travels ranging from 1 to 84 in. Assemblies are available for multicoordinate systems.