The Global Water Flow Probe Hand-held Flowmeter FP101 is a versatile tool used for measuring water flow in a variety of applications. With an expandable range of 3' to 6', this flowmeter is designed for flexibility and accuracy in detecting water flow rates. Ideal for use in hydraulics, pneumatics, pumps, and plumbing systems, this handheld device is compact and easy to use, making it a valuable tool for those in need of precise water flow measurements in their professional or industrial setting.