Maryland Code, Agriculture § 11-302

(a) Any weight and measure conforming with the standards of the United States for primary standards or otherwise obtained by the State for use as primary standards shall be the State primary standards of weights and measures if approved by the National Institute of Standards and Technology.

(b) The State primary standards shall be maintained in a safe and suitable place in the laboratory of the office of the Secretary and may not be removed from the laboratory, except for repairs or for calibration.

(c) The traceability of the State primary standards to the United States prototype standards kept by the National Institute of Standards and Technology shall be verified at least once every ten years.

(d) All secondary standards procured for the enforcement of this title shall be calibrated and verified as accurate according to the State primary standards. Traceability to the State primary standards and services of the laboratory facilities may be made available to any interested person. The Secretary may adopt rules and regulations establishing procedures and reasonable fees for this service.