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Welch Allyn® 3.5V Ophthalmoscope Heads, Coaxial with halogen light, six apertures, 28 lenses (25 to 40 diopters), illuminated lens dial, and brow rest. Choose Standard or Coaxial Head. Crossed linear polarizing filter reduces corneal reflection. Red-free filter. Autostep coaxial has 68 lenses in single-diopter steps for precise resolution. Compatible with all Welch Allyn 3.5V handles (sold separately).