Records and equipment

(a) A licensee shall maintain records relating to the sale of his or her goods and services and, upon request, shall make such records available to the Director for review. A licensee shall maintain records required to be kept under this section for a period of at least seven years from the date of the sale. (b) A licensee shall make the testing equipment available for periodic inspection by the Director or the Director's designee, and shall have all testing equipment calibrated annually by the manufacturer or a qualified testing service in accordance with American National Standards Institute specifications. (c) The Director shall adopt rules implementing the provisions of this section.