“Seal”, when used in statutory provisions relating to weights and measures, means a mark of identification which may, in the form of a stamped impression, paster, wafer or certificate, be attached to, or made a part of, any weighing or measuring instrument or device, by a sealer of weights and measures, as visible evidence that the device or instrument bearing such mark of identification has been legally tested, found correct and sealed by such sealer. “Tag”, when so used, with respect to weighing or measuring instruments or devices, means a mark, label, tag or certificate indicating that the instrument or device to which it is attached is defective and illegal for use.