Tl-q5mc1 5mm inductive proximity sensor detection switch 3-line NPN normally open DC proximity switch 10-30v - AliExpress
Inductive proximity sensors
Carlo Gavazzi Type IA Proximity Sensors | Proximity Sensors | Instrumart
LJ12A3-4-ZBX inductive proximity sensor for 3D printer Z probe auto be — Kingroon 3D
Non Flush Type Safe and Reliable Rectangular 3mm Distance Inductive Proximity Sensor - China No Inductive Sensor, Proximity Sensor Limit Switch | Made-in-China.com