This IP810P paddlewheel flow meter is a reliable way to measure liquid flow in pipes from 1/2\ up to 3\ in diameter. The sensor inserts into the pipe and uses a spinning paddlewheel – it's simple, with only one moving part, and it's field-repairable. The ruby bearings give it great low-flow sensitivity and long life. It outputs a square-wave frequency signal that can connect directly to PLCs, counters, or indicators. The body is PVC, making it corrosion-resistant for many applications. You can mount the display right on the meter or remotely. A solid, no-fuss choice for monitoring flow in water systems, irrigation, or industrial processes.