A precision 20x microscope specifically designed for Brinnell hardness testing is available through GEI International. Model MNS-0300 is designed to measure the impression made by a ball bearing in a surface for Brinnell hardness measurements and may be used for general applications requiring close inspection. Dimensions as small as 0.05 mm are projected by the reticle enclosed within the microscope. The field of view is 7.2 mm, and the microscope is compact, measuring 6,3 high x 1.38 in. in diameter. Each scope is supplied with a measuring reticle, calibration disc and vinyl storage case.