Test Program. In-service performance tests shall be made in accordance with the requirements of COMAR 20.50.02.02. Location of Tests. In-service performance tests may be made on the customer's premises, in the utility's meter shop, or in an approved meter shop. Tests for Other Purposes. Tests, such as request or referee tests, which are made for purposes other than to determine the in-service performance of a group of meters, may not be counted as in-service performance tests, except for those groups of meters being tested under the Periodic Test Schedule. Periodic Test Schedule. Periodic tests shall be scheduled in accordance with the requirements of COMAR 20.50.02.02.