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1. The metric system of weights and measures and the system of weights and measures in customary use in the United States are jointly recognized, and either system shall be used for all commercial purposes within the state. However, the International Metric System ('SI'), as defined in the Metric Conversion Act of nineteen hundred seventy-five (Public Law 94-168) and as such definition may hereafter be amended, is hereby adopted as the preferred system within the state. 2. 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 bureau of standards or its successor organization, the national institute of standards and technology, of the United States department of commerce are recognized and shall govern weighing and measuring equipment and transactions in the state.