RA Bock Diagnostics Professional 3.2V Veterinary ENT Kit (Ear, Nose and Throat) Otoscope and Ophthalmoscope - LED for Primates - All Ages 3.25V otoscope, ophthalmoscope, E.N.T diagnostic kit Use German made bulbs in all instrument heads Variable light intensity rheostat type switch that delivers an increasing light intensity through the otoscope and ophthalmoscope Instrument handle utilizes a bayonet luer-locking mechanism for changing the multiple instrument heads included in the kit Optical quality glass lens that is specially coated to help resist scratches