Illuminate and magnify! For all those detail oriented people out there, Alvin's Swing Arm Magnifier Lamp offers a 4" diameter glass viewing lens. This optically fine-ground 3-diopter lens provides 1.75 x magnification and is illuminated with a 60w light (bulb not included). A sturdy, spring-balanced arm can be locked into almost any position and reaches full extension at 36". Includes a strong metal table clamp.