All commercial laundries and cleaning establishments performing, selling or offering for sale services on the basis of weight, or using weight as a method of determining machine load, shall install for such purpose legal scales of approved type and design properly tested and sealed on their premises.
Any person, firm or corporation engaged in the business of purchasing old or used gold, silver or other precious metal, as defined by the United States Federal Trade Commission, shall, at the time of purchase, inform the seller of the troy weight of the gold, silver or other precious metal offered for purchase, the price per unit weight used to compute the purchase price and the quality of the gold, silver or other precious metal so offered for purchase.