ENT Diagnostic Set WG-I 56x34x32cm3/ctn, 20pcs/ctn, 17.5/16kgs Purpose: ENT diagnostic set is designed for ... function.Aesthetic and endurable battery handle is equipped also.WG-I,II,IIB,Diopter compensation: ±1,±2,±3,± ... 25,+40WG-IIIE,Diopter compensation: ±1,±2,±3,±4,±5,±6,±8,±10,±12,±16,±20,-25WG-XP,XPB, ... XPC,Diopter compensation: ±1,±2,±3,±4,±5,±6,±8,±10,±15,±20,±25,+40Although ear specula' ...