1. (1) The result of a referee test shall be the average of three tests at the check rate where the test results are expressed to the nearest 0.1 percent.
2. (2) A meter shall be deemed accurate if the average of the three referee tests is within ± 2.0 percent of 100 percent proof. The proof of a meter is the percent registration found when the meter is tested. A proof of 100 percent indicates the meter is accurate. A proof less than 100 percent indicates the meter is fast (+) and registers more volume than actually passed through the meter. A proof of more than 100 percent indicates the meter is slow (−) and registers less volume than actually passed through the meter.

(a)