Netafim WST Water Meter, 3 Inch, 10 Pulse/Gallon (36WST3RG10)WST Series Water Meters WST Water Meters use a double magnetic transmission to drive the register and this unique design enables the meter to handle high loads of sand since only the impeller is in contact with the water. Transmission gears are located in a sealed, dry compartment which has no contact with the water. The impeller, located in the center of the flow, allows for very accurate measurements over a wide range of flows. Available in 3, 4, 6,