10pcs/lot RPI-5100 Transmissive through-beam photoelectric switch interrupter Slot sensor slot width 2mm ROHM
https://www.vogueparade.com/shopping/EN/150412/1/1005003420117018/10pcslot-rpi-5100-transmissive-through-beam-photoelectric-switch-interrupter-slot-sensor-slot-width-2mm-rohm//