At 10.8 x 8.5 x 0.1", the DM-21 Page Magnifier from Carson is ideal for reading details from a full page of print such as newspapers or maps. The magnifier's acrylic Fresnel lens is held about 4" above the printed matter you wish to read. At only 0.1" the magnifier is thin enough to leave in your book or publication.
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it is very good Device I should buy 10 years ago.
I ordered some flimsy fresnel on Amazon so I can read my books, but they were horribly blurry. So I got this name brand here at BH and this too is horribly blurry. Fresnels just aren't too clear for reading, I guess. Can somebody make a light fresnel magnifier that is clear? Please?!