Eschenbach 12.5X hand-held magnifier has an LED light and a 30mm (diameter) plastic, anti-scratch, aspheric 50-diopter (D) lens, with 12.5X magnification. The lens has an incandescent LED light for prolonged battery life and reduced eyestrain, and an aspheric lens that is steeply curved for minimal distortion. The 12.5X has a hinged handle that connects and aligns the top and bottom pieces for secure closure, and a raised on/off switch for ease of use. Eschenbach 12.5Xmagnifiersare often used for brief, up-close tasks, such as reading prescription labels or restaurant menus.The magnifier weighs one pound, and includes a bulb, a snap-on yellow filter, and two double AA batteries. A limited lifetime warranty applies to manufacturing defects only.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”). Diopter (D) is a technical term for the measurement of the light curvature and thickness of a lens. 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”). The higher the diopter, the more magnification a lens can provide. As magnification increases, distance to the object (focal length), and field of view (diameter, or narrowness of view) decrease. Magnifiers and prescription eyeglasses have a diopter value, such as 1.5 or 2. The dioptric strength of an accessory lens, such as prescription eyeglasses or an eye loupe, must be added to the dioptric strength of the magnifier to calculate total magnification.Magnifiers are devices used to enlarge the visual appearance of an object or image. Magnifiers come in a variety of styles such as hand-held, headband, standing, clip-on, eye loupe, and those that hang in a necklace form, or fit in a trouser pocket. Magnifiers are commonly made of plastic or glass. They can have one or more lenses with varying magnification abilities, and can have a binocular configuration with a single lens, or two separate lenses. They are sometimes used with LED or fluorescent light sources to help control viewing capabilities. Magnifier ability is often expressed as magnification at a specific length. For example, 1.75X at 14” means that when a magnifier is held at 14” from a viewer’s eyes, the object will be magnified 1.75 times (X) its actual size. As magnification increases, viewing areas and focal length decrease. Magnifiers sometimes have a diopter number, expressed as + or - D, which is a measurement of strength (or power) of the lens. Some magnifiers are marked with a dioptric number on the lens. A high diopter number has a higher magnification than a low diopter number. Aspheric magnifiers, unlike spheric magnifiers, produce a sharp image to the edge of the lens for less distortion. Magnifiers are widely used in jewelry inspection and fabrication, watch-making, needlework, artwork, fly-tying, electrical inspection, reading, print inspection, and stamp-collecting.Eschenbach Optik of America manufactures low vision aids and magnification devices such as magnifiers, glasses, and telescopes for inspection, quality control (QC), and scientific applications. The company is headquartered in Danbury, CT.What’s in the Box?Eschenbach 12.5X Led Illuminated Hand Held MagnifierSnap-on yellow filter(2) double AA batteries
