Click to expand Tap to zoom S1-FM-1/4DC .01-1.60 GPM | Flow Meter by Sensor-1 Save Liquid error (snippets/product-badge line 32): Computation results in '-Infinity'% $75.00 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Flow Sensors 1/4" OD Flow Sensor. Wiring: Red(Power), Black(GND), Yellow(Pulse Singal) Flow range: .08-1.6 GPM 0.3-6L/min.