The Measuring Instruments Directive (2004/22/EC) is a directive by the European Union, which seeks to harmonise many aspects of legal metrology across all member states of the EU.[1] Its most prominent tenet is that all kinds of meters which receive a MID approval may be used in all countries across the EU. The MID covers these measuring instruments: · Water meters · Gas meters and volume conversion devices · Active electrical energy meters · Heat meters · Measuring systems for the continuous and dynamic measurement of quantities of liquids other than water · Automatic weighing instruments · Taximeters · Material measures · Dimensioning systems · Exhaust gas analysers
