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Loupe Folding Bausch & Lomb - Coddington 20X Magnification Test Kit Video instructions for changing clocksProduct Code: HLA20 Though only a single lens magnifier, its special construction, with a grooved diaphragm around its circumference, gives a good, distortion free definition of the object being viewed. 20X, 1 2" Working Distance.. Correction in these magnifiers is achieved through the use of a single thick lens with a central groove diaphragm. This provides a sharp, crisp image. Product Type: Coddington Magnifier Magnification: 20X Lens Shape: Round