(a) When the quantity of milk delivered to a milk dealer by or for the account of a producer is determined by weighing or other measurement, or when the milk fat content of such milk is used as a basis for payment, an accurate record of each such weighing, measurement or milk fat determination shall be made at once. The record shall show the quantity of milk or the fat content of such milk received for the account of each producer.

(b) Each such original record containing information with respect to the amount of milk received for the account of one or more producers, or the fat content thereof, whether the record be for one day or for more than one day, shall be dated and signed by the person making the determination, and shall be preserved by the milk dealer purchasing or receiving such milk, regardless of the fact that such milk dealer may copy such records for the purpose of making a more permanent record for the milk dealer's own use.