237-5522, Omron, Omron Inductive Threaded Barrel Proximity Sensor, M12, 4 mm Detection, NPN NO, 10 → 30 V dc, Brand Omron, Thread Size M12, Sensor Technology Inductive Omron Inductive Threaded Barrel Proximity Sensor, M12, 4 mm Detection, NPN NO, 10 → 30 V dc