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DA7 has a focal length of 6 with a 2.75X magnification.

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Genuine #7 OptiVISOR 2.75x Optical Glass Magnifier Binocular Adjustable Headband

Donegan CO-3 Clip-On Binocular Magnifier, 1.75X Magnification, 14 Focal Length : Electronics

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Donegan DA-7 OptiVISOR Headband Magnifier, 2.75X Magnification Glass Lens Plate, 6 Focal Length

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The OptiVisor® Professional Magnifier is a top-tier, precision binocular headband magnifier, renowned for its unrestricted efficiency,

OptiVisor® Professional Magnifier