In a device for measuring a fill level of a liquid in a reservoir with an ultrasonic sensor, wherein the ultrasonic sensor is arranged at the bottom end of a damping cup with a measuring tube, wherein electronic components are assigned to the ultrasonic sensor, the electronic components are encapsulated in sealing manner against the liquid that is to be measured between a floor of an electronics installation space and a cover arranged above the floor, so that the electronics installation space forms and encapsulated area. At least one support is provided inside the electronics installation space and connects the cover in force-fitting manner with the electronics installation space.