This portable set features Welch Allyn's finest diagnostic instruments. The Welch Allyn 3.5v Standard Ophthalmoscope (11710) is both versatile and economical. It features halogen light for true tissue color and consistent, long-lasting illumination and 28 focusing lenses. The Welch Allyn 3.5V Operating Otoscope Head with Specula (21700) has an open system, rotatable lens and speculum for convenient procedures. It uses a Halogen HPX lamp that provides 30% more light output for true tissue color and consistent, long-lasting illumination. The fiber optic illumination produces cool light. It has a rotatable lens and speculum. The 71000A universal rechargeable handle accepts all Welch Allyn 3.5v instrument heads. Its chrome-plated brass handle rests comfortably in the hand. It comes with an adjustable rheostat control; smooth, knurled finish; and safety switch to prevent accidental battery drainage. It can be recharged by plugging directly into a wall outlet.