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A page magnifier can fit into the front of a phone book, dictionary, etc. while the smaller fresnel lenses can be slipped into wallet or briefcase for quick scanning. The large size power lenses offer wide field coverage but with some distortion at edges. 3X magnification with 7 X 10 inch lens size, plastic fresnel. 4152 is for 1/2 dozen lenses; 4153 is for one dozen and 4154 is for box of 50.
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