Special Features:

Includes inch scale, metric scaleprojector magnification master circles6-0.15 diameter dot (in 5 in.X 11.5 inarray) for checking vision sys. Positioning accuracy, calibration squares of1.Oooo in., 0.25 in and 0.025 in size for measurement and magnification accuracies, three sets of perpendicular lines for checking squareness

Properties:

An item consisting of a cell, optical element in which is secured one or more optical elements, such as lenses, reticles, filters, windows, and the like. May include retaining rings, spacers, and/or separators. For items with focusing facilities and/or a diopter scale, see eyepiece assembly, optical instrument.