AECO SI18-C5-PNP-NO Proximity Sensor 5MM Range 10/30VDC
NPN and PNP proximity sensors - OMCH
What is the Difference Between PNP and NPN? - ShopTransmitter
M12 4mm sensing DC 5V NPN PNP NO NC LJ12A3 4 Z/BX BY AX cylinder proximity sensor switch work voltage 5VDC special for MCU|switch illuminated|switch contactorswitch 48 - AliExpress
DC/AC M18 Inductive Switch Proximity Sensors Sn 8mm 10mm NPN PNP No Nc - China Proximity Sensor and Inductive Proximity Sensors