Featuresincludes hard carrying caseits illuminated lens dial clearly identifies settingsthe coaxial optical system produces a shadow-free spot and easier entry into undilated pupilsthe crossed-linear polarizing filter reduces corneal reflectionthe red-free filter may be used with ...Featuresincludes hard carrying caseits illuminated lens dial clearly identifies settingsthe coaxial optical system produces a shadow-free spot and easier entry into undilated pupilsthe crossed-linear polarizing filter reduces corneal reflectionthe red-free filter may be used with any apertureit has 18 possible aperture combinations for greater versatility and sealed optics for better dust protectionit comes with an adjustable rheostat control and smooth, knurled finish for a no-slip gripspecificationsweight: 1. 35 Lbs.