The ornamental design for a countingdevice, as shown.
FIG. 1 is a front right perspective view of a counting device;
FIG. 2 is a bottom left perspective view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a front view thereof; and,
FIG. 8 is a rear view thereof.
The counting device is shown with a symbolic break in its length. The broken away symbols in the drawings indicate that any portion of the counting device beyond what is shown forms no part of the claimed design. The broken lines are directed to environment and form no part of the claimed design.