To accommodate vectographs from other manufacturers,  Vectograph Viewer utilizes a movable center bar. It accommodates Vectographs up to 5 3/4 inches (146 mm) tall or as short as 4 1/4 inches  (107 mm). When adjusted for use with Vectographs from Vision Assessment, the plate accommodates two vectographs. It permits use of a Wolff Wand in behind the Vectograph.
