DIRECT OPHTHALMOSCOPE Inquire Additional Description Illumination form: big spot, small spot Diopter Compensatino:0 ±1 ±2±3 ±4 ±5 ±6 ±8 ±10 ±12 ±16 ±20-25-30 (D) Power supply :1.5V*2 “C”type Illumination Bulb:2.5v/0.3A