ISP-Z3015 INSIZE Vertical Optical ComparatorINSIZE Vertical Optical Comparator Inspect your parts with surface and or profile illumination. This Optical Comparator is built with solid, stable steel construction. The X Y table positioning is done with ball screws (0. 1" rev), also with quick disconnect for fast positioning. The excellent quality optical system provides clear images and accurate magnifications. Specifications include 13. 3" x 5. 9" Table 7. 72" x 3. 78" Glass Stage Stage Travel