The commission may ascertain and prescribe for each kind of public utility governed by the provisions of this act, suitable and convenient standard commercial units of products in service. These shall be the lawful units for the purposes of this act. It shall prescribe reasonable regulations for examinations and testing of such products or service and for the measurement thereof. It shall establish reasonable rules, regulations, specifications and standards to secure the accuracy of all meters and appliances for measurements, and every public utility is required to carry into effect all orders issued by the commission relative thereto.