Section 16(1) in The Standards Of Weights And Measures Act, 1976
(1)For the purpose of deriving the value of the base units, other than the base unit of mass, the Central Government shall cause to be prepared such objects or equipments, or both, as may be necessary for the purpose and shall cause the accuracy of such objects or equipments, or both, to be certified by the International Bureau of Weights and Measures at such periodical intervals as may be prescribed, and, shall, after such certification, deposit such objects or equipments, or both, in such custody and at such place as that Government may think fit.
