otoscope + direct inspection glasses
Illumination form: large spot, small spot, no deficit, half spot
Diopter compensation: 0 ± 1 ± 2 ± 3 ± 4 ± 6 ± 8 ± 10 ± 15 ± 20 (D)
Ear specs: 2.5, 3, 4, 5 mm X2
Magnifier times: 3
Power supply: 1.5V X 2 "AA" battery (No. 5)
Bulb: 2.5V/0.45A