ENT Diagnostic Set WG-I 56x34x32cm3/ctn, 20pcs/ctn, 17.5/16kgs Purpose: ENT diagnostic ... glasses.Optical prism projects clear image on eye bottom due to its umique design,no cornea reflecting light and even lighting ... function.Aesthetic and endurable battery handle is equipped also.WG-I,II,IIB,Diopter compensation: ±1,±2,±3,±4,±5,±6,±8 ... :1.5V x 2 "C"Type ENT Diagnostic Set WG-I