Welch Allyn 3.5V Diagnostic Set, Coaxial LED Ophthalmoscope, MacroView LED Otoscope, Rechargeable Handle & Hard CaseWelch Allyn 3. 5V Diagnostic Set with Coaxial LED Ophthalmoscope, MacroView Basic LED Otoscope, one Lithium Ion Rechargeable Power Handle, and Hard Case. The Welch Allyn 3. 5V Diagnostic Set is a medical device used for diagnostic examinations of the eyes, ears, and throat. It includes a Coaxial LED Ophthalmoscope, which is used to examine the interior structures of the eye, and a MacroView Basic LED Otoscope, which is used to examine the ear canal