What are Legal Metrology Act & rules ? What is the necessity of imposing these laws?

The Govt. of India has enacted :

(1) The Legal Metrology Act, 2009

(2) The Legal Metrology (Packaged Commodities) Rules, 2011
(3) The Legal Metrology (General) Rules, 2011
(4) The Legal Metrology (National Standards) Rules, 2011
(5) The Legal Metrology (Numeration) Rules, 2011
(6) The Legal Metrology (Approval of Models) Rules, 2011
(7) The Indian Institute of Legal Metrology Rules, 2011

It ensure uniform enforcement of Standards and connected matters in Weights & Measures through out the country.