The world's most famous, economically priced diagnostic kit. 2.7 V standard illumination Nickel chrome plated metal otoscope head. 2 lenses Connector for pneumatic otoscopy . 2, 3 and 4 mm sterilizable speculums May-ophtalmoscope head : 0 to +20 and 0 to -20 diopter options Light carrier :chrome plated body. Abeslang with 2.7V bulb holder Chrome plated