Low cost hall effect water flow sensor,Food safe meter
304SS Liquid Turbine Flow Meter with Pulse Output
CGOLDENWALL 1inch Water Flow Meter 1" Digital Fuel Flowmeter Inline, 1" FNPT Inlet/Outlet, Measuring Range 2.5-26GPM, Flow Meter for Water Diesel Kerosene Gasoline, 1inch: Amazon.com: Industrial & Scientific
5000 Series Digital Flow Meters | TSI
Bonvoisin Turbine Flow Meter 1" FNPT Inlet/Outlet Fuel Flowmeter ±1% Accuracy LCD Display Flow Meter for Diesel Kerosene Gasoline 2-26.4 GPM /9-100 LPM(Batteries are not Included): Amazon.com: Industrial & Scientific
304SS Liquid Turbine Flow Meter with 4-20mA Output