You searched for "retroreflective"
RS PRO
RS PRO Retroreflective Photoelectric Sensor, Block Sensor, 30 mm → 3 m Detection Range
Part: 256-629
LED photoelectric sensor with retroreflective detection for automated machinery and assembly line control.
RS PRO
RS PRO Retroreflective Photoelectric Sensor, Barrel Sensor, 2 m Detection Range
Part: 440-5623
LED photoelectric sensor detects objects up to 2 metres away using retroreflective technology.
RS PRO
RS PRO Retroreflective Photoelectric Sensor, Block Sensor, 150 mm → 10 m Detection Range
Part: 729-5154
Block-style retro reflective sensor detects objects from 150mm to 10 metres.