Abstract: A taximeter is disclosed which comprises a housing having a front side, an electronic computer, data memories, a buffer battery, a display arrangement, one of pushbuttons and keys for providing functional control and for calling up contents of at least one of the data memories which is assigned to the display arrangement, and a parametric and diagnostic contacting arrangement. The parametric and diagnostic contacting arrangement is accessible from the front side of the housing. The parametric and diagnostic contacting arrangement and the buffer battery are accessible through an aperture which is coverable by one of a lead-sealed lid and a cover and is provided at the front side of the housing.