a fluid level measuring device for measuring a fluid filling level in a container contains a float disposed in the container and a magnet disposed in the container . the magnet is coupled to the float in terms of movement and , in the event of a change in the fluid filling level , executes a movement that corresponds to a change in fluid level . a magnetic field sensor is disposed in a zone of influence of a magnetic field generated by the magnet and outputs an electrical signal which is representative of a height of the fluid level .