AGRIBIST RG-38 High Pressure Rain Gun Sprinkler | 1.5 Inch (50mm) Female Thread | 70–90 Ft Spray Radius | 40°–360° Adjustable Rotation | Heavy Duty Agricultural Irrigation Sprinkler for Farming, Orchards & Plantations (Pack of 1)

Woltman meters are mechanical devices in which water passes through a helical rotor (propeller) mounted on bearings. The rotor’s rotation is transmitted to a counter via magnetic coupling, producing a totalizer reading. Netafim notes that Woltman meters provide exceptional accuracy and optimal performance across a wide flow range. They are robust and widely used in municipal and agricultural water measurement.