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A linen tester (also known as a linen prover) is a folding magnifier, traditionally used for measuring the threads-per-inch on linen, which is why it has a scale marked around the base. Today, they are mostly used for viewing stamps, coins, prints and photos. They come in all sizes from 15mm to 90mm, two of them even has a lights.
Those listed with a 'quantity' are limited-stock, once they are sold there are no more.
Read all about magnification and how to choose a magnifier, click here.