Customer Use. Unless the authorized tariff provides for flat-rate billing for the customer class, all water sold by a utility shall be on the basis of meter measurement. Utility Use. Wherever practicable, the use of water within the utility itself, or by administrative units associated with it, shall be metered. The meter reading sheets, cards, or records from which bills are prepared shall show the following information: Customer's name, address, and rate schedule; Identifying number or description of the meter, or both; Meter readings; Date of meter reading; If the reading has been estimated; and Any applicable multiplier or constant. Each utility shall maintain records of each meter or associated metering device, or both, which will identify each item as to its design, capacity, and application. The identifying information may include, as applicable: manufacturer, number, type, size, capacity, multiplier and constants. Each utility shall maintain records for each meter or associated metering device, or both, which shall show the dates of installation and removal from service, together with the location. Each utility shall maintain test records for each meter, which shall include the following: The date and reason for the test; The reading of the meter before making the test; The accuracy “as found” at each rate of flow; and The accuracy “as left” at each rate of flow. If the test of the meter is made by using a standard meter, then the utility shall retain all data taken at the time of the test in sufficiently complete form to permit the convenient checking of the test methods and the calculations. Meters shall be read at regular intervals as specified in the utility's tariff. A meter may not be installed which is mechanically defective, has an incorrect correction factor, or which does not meet the requirements of COMAR 20.70.06.05. The capacity of the meter and the index mechanism should be consistent with the water requirements of customer. Public Utilities Article, §§2-121, 5-101, and 5-303, Annotated Code of Maryland Effective date: July 1, 1968 (Order No. 57171) Regulation .01A amended effective May 14, 2001 (28:9 Md. R. 889)