Magnifier -Donegan Optical Opti Visor - 2X *MADE IN THE USA* – HobbyTools.com
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DA-3 - Donegan Optical - Magnifier, Headband Mount, 14 " Focal Length
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Amazon.com: Donegan DA-2 OptiVISOR Headband Magnifier, 1.5X Magnification Glass Lens Plate, 20" Focal Length : Health & Household
Donegan Optical Opti-Visor 3.5X Magnification 4-Inch Range, Quantity: Each | Fisher Scientific
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Amazon.com: OptiVISOR Magnifier #4 (Glass Lenses) : Health & Household
Donegan OptiLOUPE® LP-1 OptiVISOR® Accessory Lens, adds 2.5x magnification and has a glass lens for Donegan Optivisors and similar headband magnifiers.
Donegan Opti Visor DA-7 Headband Magnifier Binocular 2.75X Optical Glass Lens
