No test or apparatus shall be used for the purpose of determining the composition of milk or cream as a basis for payment in buying or selling milk or cream or dairy products other than the Babcock or other centrifugal machines unless such other test or apparatus has been approved for such use by regulation of the Board. In the event that the Board approves such other test or apparatus for such use, then the provisions of this article shall apply, mutatis mutandis, to such approved test or apparatus.