The ornamental design for a scale, as shown and described.
FIG. 1 is a front perspective view of the scale with its cover closed, showing the new design;
FIG. 2 is a front view of the scale with its cover closed;
FIG. 3 is a rear view of the scale with its cover closed;
FIG. 4 is a side view of the scale with its cover closed;
FIG. 5 is another side view of the scale with its cover closed;
FIG. 6 is a top view of the scale with its cover closed;
FIG. 7 is a bottom view of the scale with its cover closed;
FIG. 8 is a front perspective view of the scale with its cover opened;
FIG. 9 is a front view of the scale with its cover opened;
FIG. 10 is a rear view of the scale with its cover opened;
FIG. 11 is a side view of the scale with its cover opened;
FIG. 12 is another side view of the scale with its cover opened;
FIG. 13 is a top view of the scale with its cover opened; and,
FIG. 14 is a bottom view of the scale with its cover opened.
The broken line showing of various element of the scale are included for the purpose of illustrating non-claimed subject matter and forms no part of the claimed design.