Fowler 52-660-003 Triplet Pocket Magnifier, 10X, 15X and 20X Magnification Loupe magnifier enhances the size and resolution of an object or image for a variety of applications including jewelry-making, watch-making, electronic inspection, book-reading, and various hobbies Triplet glass lens provides distortion-free viewing Lenses are recessed from surface and pivot into the body when not in use to protect them from scratches and wear Polished chrome body is durable A dioptric number and a magnification number are not the same thing. Diopter strength represents a specific magnification power (X). For example, a 5-diopter provides 2.5X magnification (at a distance of 8")