Maryland Code, Agriculture § 11-301

(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. The definitions of the basic units of weight and measure, the tables of weight and measure, and weights and measures equivalents as published by the National Institute of Standards and Technology are recognized and shall govern weighing and measuring equipment and transactions in the State except as otherwise provided.

(b) The term “unit” may not be used or allowed to be used as a standard or norm of measure of wood intended for any purpose.

(c) Fractional parts of any unit defined in § 11-101 of this title and this section shall mean like fractional parts of the value of the unit as defined.

(d) All contracts concerning the sale of commodities shall be construed in accordance with the provisions of this section.