What is the primary purpose of a target meter in flow measurement?

The primary purpose of a target meter in flow measurement is to measure volumetric flow. Target meters function by allowing the fluid to strike a target surface, which causes the meter to register the amount of flow based on the force exerted on the target by the fluid. This force is directly proportional to the flow rate, allowing for accurate volumetric flow measurement.

While target meters can be used with corrosive materials, their fundamental design and operation focus primarily on volumetric flow measurement. Options that discuss maintaining constant pressure or providing speed measurement relate to other types of instrumentation and do not align with the main function of a target meter. Thus, while option C is relevant, it does not accurately capture the primary function of a target meter.