Cone Meters differ from other differential pressure type meters, such as Orifice Meters and Venturi Meters, basically by design only. They are all required to meet API Chapter 22.2 test criteria developed and published in 2005 and still being updated today. The Cone Meter is designed to measure liquid or gas. Cone Meters are proprietary in design and have limited third party testing due to patented designs and length of use in the Industry. The Orifice Meter is the oldest meter of the three that we will discuss and has the most third party flow lab test data available. The Venturi Meter history has mostly been utilized for liquids and steam