Amazon.com: Hicello SMC Type DA73 Air Cylinder Magnetic Reed Switch, Proximity Pneumatic Sensor LED Indicator Compatible for CDQ2B/CD85N/CXV/CXT/CDQM/CRA1 : Industrial & Scientific
D-M9BSAPC SMC | SMC Solid State Pneumatic Sensor, IP67, 24V dc, D-M9, with LED indicator | 826-2278 | RS Components
SMC D-MP Auto Switch, Actuator Position Sensor w/IO-Link