This Hands-Free™ fold-up magnifier allows two-handed examination of objects. It provides a sharp, crisp, distinct image with vivid enhancement of details and battery-powered brilliant illumination for precision work (batteries supplied). Magnifiers have perfect focus with zero distortion: Designed specifically for use in quality control, labs, food, electronics, manufacturing, and universities. White ruler markings in both inches and millimeters on the lower panel assist in making measurements. All-glass optics assure perfect focus with zero distortion. Magnifiers fold twice for compact storage. Replacement bulb Cat. No. 8014. These are mainly used in assembly, electronics manufacturing, industrial inspection, medical/life science and also for use with foods or electronics. Magnification: 2.5 X. Lens Diameter: 3-1/2-Inch. Lighted. Type/Mounting: Folding or linen. Lens/Optical System: Single Positive Lens. Control Company#: 3431.