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DIGITEN G1/4" Water Flow Sensor, Food-Grade Hall Effect Sensor Flow Meter Flowmeter Counter Connect Hose 0.3-6L/min - Arduino, Raspberry Pi, and Reverse Osmosis Filter Compatible: Amazon.com: Industrial & Scientific
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Kaifeng 4-20mA Liquid Ultrasonic Arduino Water Flow Meter Manufacturer - China Flowmeter and Water Flowmeter
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