Va. Code § 3.2-5220
Every Babcock or other centrifugal machine, or cream test or butterfat test scale, used in the Commonwealth by any inspector of milk or cream or by any person in any milk inspection laboratory for determining the composition of milk or cream for purposes of inspection, or by any person in any milk depot, ice cream factory, confectionery, creamery, cheese factory, condensed milk factory, laboratory, or other place for determining the composition or value of milk or cream as a basis for payment in buying or selling, shall be subject to inspection at least once in each year by the Commissioner. The Commissioner may condemn any Babcock or other centrifugal scale that is, in his opinion, not giving accurate results. No Babcock or other centrifugal machine or scale that has been condemned by the Commissioner shall be used in the Commonwealth by any person for determining the composition or value of milk or cream, unless the machine or scale has been changed and approved by the Commissioner.
Va. Code § 3.2-5220