Sick Photoelectric retro-reflective sensor

SICK WS36-D230 Retro-Reflective Photoelectric Sensor 1009 513

Omron Retroreflective Photoelectric Sensor, Block Sensor, 5 mm - 15 mm Detection

Pepperl + Fuchs Retroreflective Photoelectric Sensor, Block Sensor, 5 m

SICK WL9-2P331 Photoelectric retro-reflective sensor

BALLUFF BOS008M Photoelectric Retroreflective Sensor 0...5.5Mtr Detection Range

SICK Retroreflective Photoelectric Sensor 200mm Detection Range

OMRON E3Z-R86 Retroreflective Photoelectric Sensor 100mm to 4m Detection Range