DM6C is available with AA alkaline or Ni-MH batteries. Bulb ... .6W;19 lenses from 0D to 20D. The direct ophthalmoscope is used for examining the interior structures of the eye, especially ... the retina.Features:1. DM6C is available with AA alkaline or Ni-MH batteries. Bulb ... Safety Standard: GB9706.1, internal power equipment Direct Ophthalmoscope,ophthalmoscope, ophthalmic