13. (1) For the purpose of verifying the correctness of the weighing instruments and measuring instruments used in trade or commerce, the Government may cause to be prepared as many sets of standard weighing instruments and standard measuring instruments as it may consider expedient and the correctness of such instrument shall be verified, and the date of such verification shall be marked, in such manner as may be specified by the authorised person.
(2) The standard weighing instruments and standard measuring instruments shall be kept at all places where the secondary standards or working standards are kept.