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-MICROSCOPE Type Galilean-Type Binocular Microscope Magnification Changer 5 Steps by drum rotation Eyepieces: 12.5X Total Magnifications 6, 10, 16, 25, 40X Field Of View 38,24,15,9,6mm Pupillary Adjustment 48-78mm Focus Distance 100 mm Diopter Adjustment - 6D ~ +5D..