... 4m , PNP Transistor Output E3Z-R81, E3Z Omron E3Z-R81 Retroreflective Photo-electric SensorPre-Wired Type , Sensing Distance 4m , PNP Transistor ... -M1J, 0.3M,E3Z-R81-M5J, 0.3M,E3Z-R86,Retroreflective Type , Pre-Wired Type , Sensing Distance 4m , PNP Transistor OutputRetroreflective ... 0.1 to 3m , PNP Transistor Output Omron E3Z-R81 Retroreflective Photo-electric Sensor