Water Level Switch/Contactless Liquid Level Detector/Outer Adhering Type Level Sensor PNP Output Interface Sensors Detector: Amazon.com: Industrial & Scientific
Amazon.com: M12 4mm Sensing DC 5V PNP NO LJ12A3-4-Z/BY-5V Cylinder inductive Proximity Sensor Switch Work Voltage 5VDC Special for MCU : Industrial & Scientific
Amazon.com: M12 4mm Sensing DC 5V PNP NO LJ12A3-4-Z/BY-5V Cylinder inductive Proximity Sensor Switch Work Voltage 5VDC Special for MCU : Industrial & Scientific