Request For Test. Upon request by a customer and at no charge, the utility shall test the accuracy of the meter serving the customer. A utility may not perform a customer-requested meter test more than once during an 18-month period. A customer-requested test may be performed at: The metering location; The utility's meter shop; or An approved meter shop. Customer May Observe. The customer, or his representative, may be present when the meter is tested. Report to Customer. A report of the results of the test shall be made to the customer within a reasonable time after the completion of the test, and a record of the report, together with a complete record of the test, shall be kept on file at the office of the utility for at least 3 years.