• Universal photoelectric family, 18 mm threaded lens or side mounts. • Replace hundreds of other sensor styles. • Rugged housing meets IP67 and NEMA 6 standards for harsh environments. • Opposed, polarized and non-polarized retro reflective, convergent, regular and wide angle diffuse, laser, plastic or glass fiber optic, fixed-field and adjustable-field sensing modes. • WORLD-BEAM Expert™ QS18E models offer easy push-button TEACH-mode setup. • 360-degree visible multi-function LED indicator system. • Ranges up to 20 m.