Okla. Stat. tit. 2, § 2-14-32: Customary use and metric system

A. The system of weights and measures in customary use in the

United States and the metric system of weights and measures are

jointly recognized. Either one or both of these systems shall be

used for all commercial purposes in the state.

B. The definitions of basic units of weight and measure, the

tables of weight and measure, and weights and measures equivalents

as published by the National Conference on Weights and Measures are

recognized and shall govern weighing and measuring equipment and

transactions in the state.