This German-crafted magnifier has the finest optics and the most distortion-free flat-field lenses available. An independent study by the Science & Practices Committee of the California State Division of the International Association of Identification rated this magnifier the best overall of the seven top models they tested. It rated the highest in center sharpness, overall sharpness, brightness, contrast, color correction, magnification, and ease of handling. The view is crystal clear and in sharp focus across the entire field. Coding disks sold separately. Note: These coding disks fit only our MAG-CM 4.5X Fingerprint Classifier Magnifying Glass.