Section 5(4) in The Rajasthan Weights and Measures (Enforcement) Rules, 1959
(4)A working standard shall be verified with the secondary standard at least, once in every twelve months, adjusted, if necessary, and stamped with the date of verification by the Superintendent or such other person as may be authorised by him in this behalf:Provided that in the case of bullion and precious stones a working standard shall be so verified with the reference standard.
