... 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,±3,±4,±6,±8,±10,±15,±20,±25,+ ... 40WG-IIIE,Diopter compensation: ±1,±2,±3,±4,±5,±6,±8,±10,±12,±16,± ... & throat check better.Endurable and sound conductive battery handle.1.Ophthalmoscope2.Otoscope Carrier3 .Ear Specula (3,4,5,6mm ...