SENSOPART FT 25-R-PS-M4M IP69K Enclosure Rating, Proximity Sensor, 800 MM MAX Working Distance, PHOTOELECTRIC, Teach-in Adjustment, M8-4 PIN Metal Plug, PNP-Normally Open Output: Amazon.com: Industrial & Scientific
Water Level Switch/Contactless Liquid Level Detector/Outer Adhering Type Level Sensor PNP Output Interface Sensors Detector: Amazon.com: Industrial & Scientific