If you already have your favorite 3.5volt rechargeable handle, then you’ll be thrilled to know all you need is the Welch Allyn 3.5 volt standard ophthalmoscope head, model 11710. Providing both versatility and a comfortable price point, this amazing instrument is going to surprise you with all of its technologically advanced perks not the least of which is our long lasting, consistent, cool, bright white, Halogen light that ensures you observe true tissue color on every exam, with no reflections or obstructions. With six general use apertures including, micro, small and large spot sizes, as well as a fixation target and slit aperture and a red free filter, this unit provides more than seems possible. The twenty eight focusing lenses have a range of -25 to +40 diopters. Always ergonomically conscious, we’ve also included a rubber brow rest to prevent the scratching of glasses. Whether you work in a busy emergency room, a standard medical office, a school medical office or out in the field with a paramedic unit or as a home health care professional, this handy, versatile ophthalmoscope head attached to your favorite Welch Allyn or Welch Allyn compatible rechargeable handle, will make accurate diagnostics easier and more efficient. When you want to make sure your equipment will work as hard, as efficiently and as accurately as you do, then you’ll want to make sure your equipment comes from the most respected name in medical instrumentation, the one preferred by medical professionals everywhere, Welch Allyn.