How do I calculate magnification for my magnifier?, Durable Magnifiers for Industrial Use

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Read small prints with greater comfort and clarity using large handheld 7x magnifier. Scratch-resistant optical glasses for a clear, sharp and distortion-free view. Designed with tough rubber frame defense to prevent glass from shattering when dropped accidentally. Anti-drop rubber handle is reinforced with improved grip to lessen chances of it falling off your hand. 7x enlargement is perfect for reading, examining of maps, or any projects that may require magnification.

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How do I calculate magnification for my magnifier?