100. ACCURACY All watt-hour and demand meters shall be tested and adjusted to register accurately to within the limits specified in Rules 18 and 19 before initial installation or within sixty (60) days after such installation. However, a utility may rely upon the statement of accuracy furnished by a meter company on meters purchased or repaired, provided that a test check shall be made on samples taken from each order to determine that said order is in accordance with the accuracy specified. Meters reinstalled shall be tested before such reinstallation or within sixty (60) days thereafter if more than three (3) years have elapsed since initial installation or prior test.105. LOW POWER FACTOR Watt-hour meters that are to be used for customers found to have low power factor (lagging current) shall be tested and adjusted before installation to register correctly to within two (2%) per cent plus or minus, at a power factor of approximately fifty (50%) per cent, and at approximately one hundred (100%) per cent estimated current.