Okla. Stat. tit. 2 § 14-4
The Bureau of Standards shall be available to all state departments, municipal and private corporations, and citizens of this state. The Bureau shall be the highest official authority with regard to standards of weights, measures, and testing devices, and methods of weighing, measuring, and testing for this state. The findings of the Bureau of Standards in any case or question shall be considered prima facie evidence of the correctness of the case or question. All officers enforcing the standards for weights, measures, and testing devices in this state shall submit their weighing, measuring, and testing devices to the State Bureau of Standards at those periods determined by the Director of the Bureau of Standards for certification and seal.
Okla. Stat. tit. 2, § 14-4