Okla. Admin. Code § 165:15-15-8
Tolerances are primarily accuracy criteria for use by the regulatory official. However, when a liquid measuring device is being adjusted for accuracy, either initially or following repair after official rejection, the effect should be to adjust as closely as practicable to zero error. Equipment owners or operators shall not take advantage of tolerances by deliberately adjusting their equipment to have a value or to give a performance at or close to the tolerance limit, nor should the repairman or serviceman bring measuring devices merely within tolerance range when it is possible to adjust closer to zero error. If the majority of meter tolerances measured by the fuel specialist are below zero, the fuel specialist shall require those affected meters be recalibrated as close to zero as possible.
Okla. Admin. Code § 165:15-15-8