Va. Code Ann. § 3.2-5706

Every service agency shall submit any weights or measures standard and calibrating equipment used or to be used by the service agency to the Commissioner for examination and verification, in accordance with a schedule established by the Commissioner. Any weights or measures standard or calibrating equipment calibrated by the weights and measures laboratory of another state, of a territory, or of a protectorate of the United States shall be deemed to be properly calibrated and hence lawful for use in the Commonwealth if the service agency proffering for use the weights or measures standard or calibrating equipment can demonstrate the traceability of the weights or measures standard or calibrating equipment.