law: Standards of Weights and Measures Act, 1976 
  4. Units of weight or
  
  measure to be based on metric system. – 
  (1) Every unit of
  
  weight or measure shall be based on the units of the metric system
  (2) For the purposes
  
  of sub-section (1), -
  (a) The
  
  international system of units as recommended by the Central Conference on Weights
  
  and Measures, and
  (b) Such
  
  additional units as may be recommended by the International Organization of
  
  Legal Metrology, shall be the units of the metric system.