The ornamental design for a displaydevice with graphicaluser interface for a combinedweighinginstrument, as shown and described.
FIG. 1 illustrates a graphical state of a graphical user interface displayed on a display device associated with a combined weighing instrument.
The dashed lines of FIG. 1 illustrate unclaimed graphical user interface elements. The outer dot-dash lines in FIG. 1 illustrate a display device for a combined weighing instrument, upon which a graphical user interface is displayed with the graphical state illustrated in FIG. 1 for carrying out various operations of the combined weighing instrument. The inner dot-dash lines in FIG. 1 represent the boundary of the claimed design. The dashed lines form no part of the claimed design.