Capacitive Proximity Sensor, Threaded Body, 18 mm, 3-Wire, 10-30 VDC, 0.59 inch (15 mm) Sensing Range, Unshielded, 4-Pin Micro DC Connection. Nylon Housing. NEMA Rating: 1, 2, 3, 3S, 4, 12, 13. Used to detect Metallic and Non-metallic objects as well as fluids (Liquid Levels).