No person or his or her agents or servants engaged in the business of buying milk or cream on the basis of, or in any manner with reference to, the amount or percentage of butterfat contained therein, shall take, collect or use for testing purposes an unfair or an inaccurate sample, or underread, overread or erroneously manipulate the test commonly known as the “Babcock test” used for determining the percentage of such fat in said milk or cream, or falsify the record thereof, or make the “Babcock” reading except when the fat has a temperature of 135 degrees to 145 degrees Fahrenheit, or use for such test quantities other than 17.6 cubic centimeters in the case of milk and 9 grams or 18 grams in the case of cream. In all tests of cream, the cream shall be weighed and not measured into the test bottle.