Among the macro industrial policy tools, the legal metrology is one of the less known even if it has a strategic importance and it is very used in UE, but of great strategic importance, we indicate the legal metrology. The legal metrology has an underwriting role in the proper functioning of the market (macro aspect) and its actors (micro aspect - enterprises and consumers) and represents a strategic asset and a precondition to every action and industrial policy intervention both nationally and European.