DESC: • 2.5v halogen light source for true tissue color and long lasting lamp performance. • 5 aperture selections (small aperture, large aperture, fixation aperture, semicircle aperture, and red-free filter). • 17 lenses from -20 to +20 diopters for better resolution. • Silicon coated protection of glass components. • Rubber brow rest prevents scratching of eyeglasses. • 2.5v Halogen light source for true tissue color and long lasting lamp performance. • 5 Aperture selections ( small aperture, large aperture, fixation aperture, semicircle aperture, and red-free filter ). • 17 Lenses from -20 to +20 diopters for better resolution. • Illuminated dial. • Silicon coated protection of glass components. • Built-in lens dust cover. • Rubber brow rest prevents scratching of eyeglasses. • Ophthalmoscope head made from polymid - an impact resistant, spaceage thermoplastic • "AA" metal battery handle interchanges with pocketscope. • Pocket clip with integral on/off slide switch for amb