ENT Diagnostic Set WG-I 56x34x32cm3/ctn, 20pcs/ctn, 17.5/16kgs Purpose: ENT diagnostic set is designed for doctor's ... .Optical prism projects clear image on eye bottom due to its umique design,no cornea reflecting light and even ... function.Aesthetic and endurable battery handle is equipped also.WG-I,II,IIB,Diopter compensation: ±1,±2,±3,±4,± ... .3A) Power Supply:1.5V x 2 "C"Type ENT Diagnostic Set WG-I