The TR3 Flow Meter measures according to the Turbine Wheel Principle. A flow meter for use with many systems and the ability to be connected at the drum pump, at the nozzle, or to be connected to the B1/B2 Battery and B2 Vario Pumps. The TR3 is made for measuring thin bodied fluids and has a range of measurement from 1.3 GPM - 31.7 GPM. This meter is also capable of displaying the partial and total volume of the fluids being measured.