31 Pa. Stat. § 700j-607
It shall be unlawful for any milk dealer or other person engaged or employed in the business of buying or receiving milk from producers, or selling or delivering milk to stores or consumers, on the basis of, or with reference to, the amount or percentage of butterfat contained therein, to take, collect or use for testing purposes an unfair or inaccurate sample, or to underread, overread or erroneously manipulate the "Babcock Test" or any other test prescribed by the board as an acceptable test method used for determining the amount or percentage of butterfat in such milk, or to falsify the record thereof, or to make the "Babcock" reading, except when the fat has a temperature of one hundred thirty-five degrees (135) to one hundred forty-five degrees (145) Fahrenheit, or to use for such test quantities other than seventeen and six-tenths (17.6) cubic centimeters, in the case of milk, and nine (9) grams or eighteen (18) grams, in the case of cream. In all tests of cream the cream shall be weighed and not measured into the test bottle.
It shall also be unlawful for such milk dealer or other person, so engaged or employed, to ascertain the "Babcock Test" of the milk by use of any glassware except standard "Babcock Test" glassware and weights which have been previously inspected and approved by the Department of Internal Affairs. If the amount or percentage of butterfat is determined by any method other than the "Babcock Test," no utensil or instrument shall be used in such determination until it has been inspected and approved by the board.
31 P.S. § 700j-607