The FLM-3 is a consumer flow meter perfect for under-the-sink monitoring of the flow that has passed through your filtration (RO/DI) system. HM Digital Flow meter ranges start from 0.8-8.0 LPM. The FLM-3 is a consumer-friendly flow meter perfect designed specifically for monitoring water flow in under-the-sink filtration systems under the sink monitoring of the flow that has passed through your filtration (RO/DI) system. The FLM 3 Flow Meter is a reliable, versatile, and effective instrument for measuring the flow of liquids in various industries. It is built to be strong and durable, making it suitable for tough environments. The meter is versatile, meaning it can be used in many different applications, from small labs to large factories.