The 3.5v Retinoscope which provides superior illumination, is the right design for accurate refraction. It has the unique quality of one-hand operation and the comfort of a rubber brow rest. Move up and down to focus, rotate continuously in either direction. Refraction becomes fast and easy with this streak retinoscope. Some of its features are: External focusing sleeve that's easy to grip and easy to manipulate. Crossed-linear polarizing filter eliminates glare from trial lenses for easier exams. Magnetic age-appropriate targets for dynamic retinoscopy. Allows easy one-hand operation for streak focus and 360° streak rotation. Interchangeable streak retinoscope can be converted to a spot retinoscope by simply changing the lamp. Fiber optic illuminated red and green fixation points Key Components 3.5v Halogen HPX™ Streak Lamp Warranty Welch Allyn will repair or replace, free of charge, any parts of its own manufacture proven to be defective through causes other than misuse, neglect, damage in shipment, or normal wear.