Positive Displacement MetersSparling’s inventory of Oval positive displacement meters are designed for flow measurement of very small flow rates in applications requiring high accuracy. These robust positive displacement fluid flow measuring devices are available in a wide variety of configurations and options including digital displays, mechanical counters, and battery powered models.LSFThe Sparling/OVAL Flowmate is a positive displacement flowmeter designed for the measurement of very small flow rates in applications requiring high accuracy. It is an ideal flow measurement device for various fuels like kerosene, diesel, fuel oil, etc. Units are available for remote registration and totalization using either a reed switch or pulse generator output.