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Specification: Material: High quality optical glass. Achromatic.Large visual field.Long depth of field. Interpupillary distance is adjustable. It can be assembled on the ordinary glasses. Magnification: 3.5x Working distance: 280-380mm Field of View: 160mm Package List 1x Dental Magnifier 1x Cleaning cloth 1x Screwdriver 1x Package bag 1xManual