Large Stanley London Brass 3-Leg Magnifier Made from solid brass and has a special clear coating that never requires polishing and will not tarnish. Features a large 40 mm (1 19/32 inch) diameter viewable area. The magnifier uses precision two-element ground glass optics for clear 3-power magnification with a flat field that is sharp even at the edges. The power of the magnifier is adjustable by rotating the threads. The magnifier measures 2 1/4 in. (5.7 cm) in diameter and weighs 6.5 ounces (184 grams). The height of the magnifier can be adjusted between 2 inches (5.1 cm) and 2 1/2 in. (6.4 cm).