M3, M4, M5, M6, Miniature, Inductive Proximity Switch, Small Metal Sensor, Two or Three Wire, NPN/PNP, DC 24V,NO/NC - AliExpress
M3 Thread Installation Miniature Retro-Reflective Proximity Switch 25cm Range for New Energy Industry - China DC Photoelectric Sensor, PNP/NPN Photoelectric Sensor | Made-in-China.com
Mini Flat Pack Sensors | Allen-Bradley
Super small proximity sensors for non magnetic metals - ET series | KEYENCE America
Proximity Switch Reed Sensor Cylindrical Miniature Position Liquid Detect Sensing - China Reed Switch, Proximity Sensor | Made-in-China.com
Tiny proximity switch one of the world's smallest
Sensors for limited installation space | Baumer USA
1pcs Small cylindrical type proximity sensor ultra short small proximity switch Φ3 Φ4 M5 Φ6.5 M8 switch sensor NPN PNP sensor - AliExpress
10160318 - Proximity sensors (Baumer) - Davis Controls