Okla. Stat. tit. 2, § 2-14-33: State primary and secondary standards

Weights and measures that are traceable to the United States

prototype standards supplied by the federal government or approved

by the National Institute of Standards and Technology shall be the

state reference standards of weights and measures and shall be

maintained in the calibration prescribed by the National Institute

of Standards and Technology. All field standards may be prescribed

by the State Board of Agriculture and shall be verified upon their

initial receipt and as required by the Board.