Aristotle once said, “Science begins and ends with Measurement.” Without question, measurement is a function that truly influences the economics of the gas industry. This is true because the revenue of the industry, for the most part, is determined by the registration from meters. This is why it is said that meters are the “Cash Registers” of the business. Therefore, it is essential for service companies such as Reliant Energy to prove or test each meter. Transfer Proving is a portable method of meter performance testing. The methods to prove meters must continually be improved to assure accuracy of revenue at the lowest feasible maintenance costs