A device for electrical measurement of the level of a fluid contained in a fuel tank of a motor vehicle is disclosed. In addition to a variable resistance float sensor in a dip tube, a travel sensor is arranged in the dip tube to determine the distance between the dip tube and the bottom of the tank in order to offset measurement errors caused by tolerances in the manufacture of the tank and resultant differences in the mounting position of the dip tube in the tank. The travel sensor includes a spring load rod extending to the bottom of the tank and a variable resistance connected to the rod to produce a calibration value.