law: The Legal Metrology Act, 2009
  7. Standard units of
  
  weights and measures. -
  1.  The
  
  base units of weights and measures specified in section 5 shall be the standard
  
  units of weights and measures.
  2.  The
  
  base unit of numeration specified in section 6 shall be the standard unit of
  
  numeration.
  3.  For
  
  the purpose of deriving the value of base, derived and other units mentioned in
  
  section 5, the Central Government shall prepare or cause to be prepared objects
  
  or equipments in such manner as may be prescribed.
  4.  The
  
  physical characteristics, configuration, constructional details, materials,
  
  equipments, performance, tolerances, period of re-verification, methods or
  
  procedures of tests shall be such as may be prescribed.