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Pupillary Distance Meter ruler, Measure Optical Ruler Pupil Distance Meter Eye Ophthalmic Tool, Measurable range Total interpupillary distance: 42~82mm, left and right interpupillary distance: 21~41m : Amazon.co.uk: Health & Personal Care
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Multipurpose PD Optical Ruler for Reading Pupil Distance Meter Eye Ophthalmic Straight Edge, Comfortable and Lightweight Optical Ruler to Measure Height of The Pupil and All Lengths of Frames : Amazon.co.uk: Stationery
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