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Welch Allyn 74710 Transformer Otoscope Ophthalmoscope Owners Manuals, User Guides, Instructional Help Documents & Operating Information - c46702_units.pdf. Welch Allyn 74710 Opthalmoscope and Otoscope powers up and with transformer unit on, instruments will light automatically when handles are lifted from holder. The otoscope is intended to allow inspection of the external ear, ear canal, and tympanic membrane under magnification. A secondary use of the otoscope may be instructions are easy to follow and New Line of Parts to fit Welch Allyn 74710 & 767 Wall Transformers! 25200/25020 Otoscope, 73500 Handle.Browse Welch Allyn 74710 Transformer Otoscope Ophthalmoscope owner's manuals, user guides, instructional help documents & operating information to learn