This document discusses using multiphase flow meters (MPFMs) for various oil and gas applications including production testing, reservoir monitoring, remote operation, and fiscal allocation. It describes measuring complex emulsions of water, gas, and oil. Special applications mentioned include measuring phase composition and flow rates in pulp, indicating solids in nuclear reactor cooling systems, and controlling molten metal flow. Wireless passive acoustic flow meters are discussed for measuring hot and cold water, gas, and heating systems in apartments. The final sections discuss using MPFMs in process control for well testing, developing intelligent well simulation models, and optimizing field operations based on multiphase flow rates online. It provides an example of how energy costs are impacted by production