The ornamental design for a scale, as shown and described.
FIG. 1 is a front, right side, bottom perspective view of a scale showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken line (dashed line) showing of portions of the scale are for illustrative purpose only and form no part of the claimed design. The chain lines are provided to show the borderline between the claimed portions and the broken line portions which are not being claimed.