GASCO, INC., formerly the HONOLULU GAS COMPANY, is unique in that its entire gas distribution system is supplied by manufactured gas. GASCO bills its customers by the THERM, which normally requires two measurements: a volumetric measurement and a heating value measurement. Due to variations in the gas composition and heating values resulting from the manufacturing process, determination of "Therms" becomes more complex. In order to achieve accuracy, the SNG measurement system has grown to include the following components: