1. No person shall retain in his possession any weight, measure or weighing and measuring device or system, knowing it to be false, with intent to use it or permit to be used for determining the quantity of any commodity. Possession of the same shall be prima facie evidence of a violation of this section. 2. For the purpose of purchase, sale or service, no person shall use a false weight, measure, device or system for determining the quantity of any commodity. If the seller furnishes the weight or measure of the commodity sold, he shall not sell or deliver less of any such commodity than the quantity represented to be sold; if the buyer furnishes the weight or measure of the commodity purchased, he shall not receive or accept more of any such commodity than the quantity represented to be purchased.
New York Legal Code