100. WATER METER TESTERS Each utility furnishing metered water service shall maintain suitable water meter testers at each plant having 100 or more meters and shall keep same in proper adjustment so as to register accurately the condition of the meter at all times.105. CERTIFICATE OF CALIBRATION REQUIREMENTS Each water meter tester shall be accompanied by a certificate of calibration indicating that the volumes or weighting devices used have been referred to proper standards, which standards have been certified by the National Bureau of Standards or some testing laboratory or other authority of recognized standing.110. LOCATION OR METER TESTER Meter testers shall be located in suitable working space, easily accessible and equipped with all necessary facilities and accessories. They shall be available for inspection and use at all reasonable hours by the authorized representatives of the Commission.115. PERIODIC TESTS Unless otherwise ordered by the Commission, each service water meter installed shall be periodically removed, inspected and tested and in accordance with the following schedule or as often as the results obtained may warrant to insure compliance with the provisions of Rule 64. Five-eights inch meters, ten years or for each 20,000 cubic feet of registration.
Three-fourths inch meters, eight years or for each 300,000 cubic feet of registration.
One inch meters, six years or for each 400,000 cubic feet of registration.
All meters above one inch, every four years.