In addition to the state standards provided for in § 3.2-5604, there shall be supplied by the Commonwealth at least one complete set of copies of the state standards to be kept in the office or laboratory designated by the Commissioner and to be known as “office standards,” and in addition such “field standards” and such equipment as may be found necessary to carry out the provisions of this chapter. The office standards and field standards shall be verified upon their initial receipt and at least once each year thereafter. The office standards shall be verified by direct comparison with the state standards. After verification of the office standards the field standards shall be verified by comparison with the office standards.