Okla. Stat. tit. 2, § 2-14-3: State standards

The weights, measures, and testing devices received from the

United States pursuant to Joint Resolutions of Congress approved

June 14, 1836, and July 27, 1866, now in the care and custody of the

State Bureau of Standards, and the weights and measures in

conformity with the Resolutions, when certified by a qualified

laboratory, shall be the state standards of weights and measures.

Copies of the state standards of weights and measures and other

weights, measures, and apparatus shall be supplied by this state to

implement the provisions of this article.