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The ornamental design for a power testing device, as shown and described. |
FIG. 1 is a perspective view of a power testing device showing my new design;
FIG. 2 is a front view of the power testing device;
FIG. 3 is a rear view of the power testing device;
FIG. 4 is a right side view of the power testing device;
FIG. 5 is a left side view of the power testing device;
FIG. 6 is a bottom view of the power testing device; and,
FIG. 7 is a top view of the power testing device.
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