Inductive Proximity Sensor, Tubular, Unshielded, End Sensing Surface, 18 mm Sensing Range, 20-132V AC, 50/60 Hz, 18 mm Diameter, Threaded Barrel, 3-Pin Micro AC Connector, Standard Frequency, N.O. by Default (Field Programmable). Stainless Steel Housing. NEMA Rating: 4, 4X, 6, 6P, 12, 13. Used to detect Metallic objects with SmartSense Technology allowing customizable range, band sensing, nuisance metal rejection, timing delays and over/under speed detection.