ENT Diagnostic Set WG-I 56x34x32cm3/ctn, 20pcs/ctn, 17.5/16kgs Purpose: ENT ... diagnostic function.Aesthetic and endurable battery handle is equipped also.WG-I,II,IIB,Diopter compensation: ±1,±2,±3,±4,±5 ... compensation: ±1,±2,±3,±4,±5,±6,±8,±10,±12,±16,±20,-25WG-XP,XPB,XPC,Diopter compensation: ±1,±2,±3 ... Supply:1.5V x 2 "C"Type ENT Diagnostic Set WG-I