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US211M Hall Water Flow Sensor Reader 24V Flow Reader and USC-HS20TA integrated hall effect water flow sensor with solenoid Valve You may need other version of 24V power adaptor here... YF-S301 Water Flow Sensor 0.3-10LPMFeatures:The hall effect water flow sensor is light, nimble outline, small size and easy to install. All materials are in line with SGS testing standards. There is a