NBB4-12GM50-E2-V1
PEPPERL & FUCHS NBB4-12GM50-E2-V1 INDUCTIVE PROXIMITY SENSOR 30V DC
A nice touch is the locking mechanism on Allen Bradley safety switches.
New In Bag For PEPPERL+FUCHS NBB4-12GM50-E2-V1 Photoelectric Sensor US Stock
This unbranded item is a plain but reliable part of my toolkit.
New In Bag NBB5-18GM50-E2-V1 For PEPPERL+FUCHS Photoelectric Sensor US Stock
A nice touch is the unbranded design that doesn't attract unwanted attention.