A modular meter for flow consumption by a subscribing customer, characterized in that the modular meter includes at least: a base module allowing the connection configuration of the flow delivery point to be adapted, to provide the connection of the flow distribution lines and the supply lines of the subscriber installation, said base module being equipped with a metering connection interface; a metering module equipped with a connection interface for connecting to said base module, via said metering connection interface; said modular meter being characterized in that: all of the electrical components performing non-intelligent functions of a permanent nature are installed in said base module, and in that all of the electronic components performing intelligent functions of a changeable nature are installed in said metering module; and in that it comprises a matching module for matching the functions of the base module and the metering module, said matching module enabling the performance, during the connection of said metering module to said base module, of at least a function of calibration of the values of the current and voltage delivered by said base module respectively subscribed, requested and measured by said metering module, according to the installation parameters of the subscribing customer; wherein said electrical components performing non-intelligent functions of a permanent nature include: current sensors, voltage sensors, cut-off units, voltage connection circuits, communications modules or physical links, to the subscribing customer and to the flow-distributing entity; and wherein said electronic components performing intelligent functions of a changeable nature include: metrological preprocessing components, electronic supply components, components for processing by microcontroller or microprocessor, networked communications components. a base module allowing the connection configuration of the flow delivery point to be adapted, to provide the connection of the flow distribution lines and the supply lines of the subscriber installation, said base module being equipped with a metering connection interface; a metering module equipped with a connection interface for connecting to said base module, via said metering connection interface; all of the electrical components performing non-intelligent functions of a permanent nature are installed in said base module, and in that all of the electronic components performing intelligent functions of a changeable nature are installed in said metering module; and in that it comprises a matching module for matching the functions of the base module and the metering module, said matching module enabling the performance, during the connection of said metering module to said base module, of at least a function of calibration of the values of the current and voltage delivered by said base module respectively subscribed, requested and measured by said metering module, according to the installation parameters of the subscribing customer; wherein said electrical components performing non-intelligent functions of a permanent nature include: current sensors, voltage sensors, cut-off units, voltage connection circuits, communications modules or physical links, to the subscribing customer and to the flow-distributing entity; and wherein said electronic components performing intelligent functions of a changeable nature include: metrological preprocessing components, electronic supply components, components for processing by microcontroller or microprocessor, networked communications components.