Inductive Sensor,
Omron E2E-C04N03-CJ-B2 0.3M Proximity Sensor Module, 2 to 7cm Range, PNP Output
Inductive Proximity Sensor Module, 2 to 7mm Sensing Range, 3mm Sensing Distance, 10 to 30V DC
Proximity Sensor NO PNP 3mm 10V to 30VDC 3-Pin
Proximity Sensor NC NPN 3mm 10V to 30VDC 3-Pin