Check the listing for details. Vision Luxo WAL025974 - Wave LED Magnifier (ESD Version), 30' Arm, 3.5 Diopter. Listed at 731.57 USD. /sq. (conductive). /sq. (static dissipative). The self-balancing shade and hands-free neck assembly make exact positioning easy. The WAVE LED ESD is supplied with a 6.75 x 4.5, 3.5- (1.88X) or 5-diopter (2.25X) white crown optical-quality glass lens.