AUTONICS PR12-4DN Proximity Sensor, Inductive, 12 mm, Round. More details: Cylindrical Proximity Sensor, Sensing Method Inductive, Diameter 12mm, Power Requirement 12 to 24VDC, Circuit Type NPN, Output Mode NO, Unshielded, IP Rating 67, Electrical Connection 2m Cable, Case Material Nickel Plated Brass with Plastic Face, Basic Material Metal, Max. Detecting Distance 4.0mm, Length 58mm, Operating Frequency 500 Hz, Operating Temp. Range -13 Degrees to 158 Degrees F, Max. Current Load 200mA, Standards CE Compliance