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.