The ornamental design for a weighing apparatus, as shown and described.
FIG. 1 is a front, top, right hand side perspective view of a weighing apparatus embodying the principles of my our design shown in a condition of use;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is rear view thereof;
FIG. 6 is a side view thereof as seen from the left-hand side of FIG. 1; and,
FIG. 7 is a side view thereof as seen from the right-hand side of FIG. 1.
Components in the bottom view of FIG. 3 being shown in phantom lines and forming no part of the claimed design.