The calibrated energy meter can be used for measuring and billing active energy in industry, households, commerce, and building technology. The transmission of values to data collection, billing, and optimization systems, as well as building automation and control technology, is done via pulse output, LON, M-Bus, or L-Bus interfaces. The installation itself is extremely simple, as the meter detects connection errors and signals them immediately. Maximum convenience is provided by the display of active power, as it gives immediate information about the current circuit load.