Featuresincludes hard carrying caseits 68 lenses in one diopter steps provide better resolutionit has 6 apertures for general and specialist useits rubber brow rest prevents scratching of eyeglassesits illuminated lens dial clearly identifies settingsthe coaxial optical system ...Featuresincludes hard carrying caseits 68 lenses in one diopter steps provide better resolutionit has 6 apertures for general and specialist useits rubber brow rest prevents scratching of eyeglassesits illuminated lens dial clearly identifies settingsthe coaxial optical system produces shadow-free spot and easier entry into undilated pupilsthe crossed-linear polarizing filter reduces corneal reflectionthe red-free filter may be used with any aperturethe chrome-plated brass handle rests comfortably in the handit comes with an adjustable rheostat control and smooth, knurled finish for a no-slip gripsafety switch prevents accidental battery drainagespecificationsweight: 1. 35 Lbs.