The ultimate magnifier lamp includes a precision 30? spring-arm and convenient guide handle for easy positioning. Included full-spectrum 13W fluorescent tube simulates natural daylight. Features one 4.5? three-diopter magnifier lens, one 1? five-diopter magnifier lens and one 1? eight-diopter magnifier lens. Enlarges small print up to 175%. Includes a convenient edge-clamp mount. On/off rocker switch located on magnifier head.