"Full featured pocket diagnostic set that sacrifices nothing but size. 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, space-age thermoplastic. "AA" metal battery handle interchanges with pocket Otoscope. Pocket clip with integral on/off slide switch for ambidextrous use. 1 Year Warranty. Lifetime Quality Performance Guarantee on optics. "
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