A metering device with an applicator housing having an application orifice for medium discharge. A metering pump conveys medium from a medium store to the applicator. An electronic counting module having a stroke detection means operatively engageable with a relatively movable pump portion of the metering pump. A data processing processor evaluates signals from the stroke detection means, and an indicator unit indicates data produced by the data processing processor. A current source supplies the data processing processor with current. A module housing houses an electronic counting module. The external dimensions of the module housing are conformed to the internal dimensions of a reception space. The reception space is open on one side of the applicator housing, so that the module housing can be inserted completely into the reception space through the opening and be fastened therein.