ENT Diagnostic Set WG-I 56x34x32cm3/ctn, 20pcs/ctn, 17.5/16kgs Purpose: ... diagnostic function.Aesthetic and endurable battery handle is equipped also.WG-I,II,IIB,Diopter compensation: ±1,±2,±3,±4 ... ,±5,±6,±8,±10,±12,±15,±20,-25,-30WG-III,Diopter compensation: ±1,±2,± ... Diopter compensation: ±1,±2,±3,±4,±5,±6,±8,±10,±12,±16,±20,-25WG-XP,XPB,XPC,Diopter compensation: ±1,± ...