Except as otherwise provided in §§C and D of this regulation, a person may not offer for sale, sell, or use a commercial weighing and measuring device in this State unless it has been approved by the Secretary. The Secretary shall approve a weighing and measuring device for sale or use in this State if it: Has a valid Certificate of Conformance or a Maryland Certificate of Approval; and Is not otherwise prohibited for sale or use as provided under Regulation .04 of this chapter. The limitation that a weighing or measuring device be approved by the Secretary before a person may offer it for sale, sell, or use it in this State does not apply to the following devices: A commercial weighing and measuring device manufactured before October 1, 1992; A counting scale; A weighing or measuring device that the Secretary has approved previously and whose approval has not been revoked; and A noncommercial weighing or measuring device such as an estimator. If a weighing or measuring device does not have either of the requisite certificates but is accurate, the Secretary may permit the device's use for a specified period of time, provided, however, the device is: Submitted for evaluation under the State or National Type Evaluation Program; or Replaced with an approved device within the specified period of time.