... Type , Sensing Distance 4m , NPN Transistor Output Omron E3Z-R61 Retroreflective Photoelectric SensorPre-Wired Type , Sensing Distance 4m , NPN ... Transistor OutputE3Z-R61, E3Z-R61, 0.5M,E3Z-R61, 2M,E3Z-R61, 5M,E3Z-R61H,E3Z-R61K, 2M,E3Z ... , Pre-Wired Type , Sensing Distance 4m , NPN Transistor OutputE3Z-R61 2M Retroreflective Type , Pre-Wired Type , Sensing Distance 4m , ...