(1) In any proceedings for an offence under this Ordinance, a certificate purporting to be signed-
(a) by an authorized officer or a public officer working in a Government laboratory and certifying that the goods specified in the certificate were weighed, measured or counted by him on a particular date and were of a particular weight, measure or count;
(b) by an authorized officer and certifying the degree of accuracy of any weighing or measuring equipment used for trade that was tested by him on a particular date;
(c) by a public officer in charge of a Government laboratory and certifying the degree of accuracy of any weighing or measuring equipment or any working and field standard that was tested by him at the said laboratory on a particular date,
shall be admitted in evidence before any magistrate on its production without further proof.
(2) On the production of a certificate under subsection (1)-
(a) the magistrate before whom it is produced shall, until the contrary is proved, presume that the certificate was signed by the public officer and at the time specified therein; and
(b) the certificate shall be prima facie evidence of all the matters contained therein.