Amazon.com: Telemecanique XS518BSDAM12 Optimum Series Inductive Proximity Sensor, Heavy-Duty, Short Metal 18-mm Barrel, Flush Mount, 2-Wire DC Wiring, PNP/NPN Input, NO Output, M12 Micro-Connector : Industrial & Scientific
TRI-TRONICS EZPRC DIN Rail, RED LED, 45 MA, NPN/PNP Output, Light EMITTER, M12 Connector, Sensing Range Depends ON Optical Block, PHOTOELECTRIC Sensor, SMARTEYE EZ-PRO, 5-Wire, Polarity Protected, 1: Amazon.com: Industrial & Scientific
Omron EESX672P Photomicro Sensor, 5 mm Through-Beam, 2 × 0.8 mm Object, PNP Output: Electronic Components: Amazon.com: Industrial & Scientific
SENSOPART FT 25-R-PS-M4M IP69K Enclosure Rating, Proximity Sensor, 800 MM MAX Working Distance, PHOTOELECTRIC, Teach-in Adjustment, M8-4 PIN Metal Plug, PNP-Normally Open Output: Amazon.com: Industrial & Scientific
PNP Output 4-Channel photoelectric Isolation Module PLC Signal Level Voltage Conversion Board unidirectional Transmission - (Size: Board, Color: 1.8V to 12V): Amazon.com: Industrial & Scientific