I claim the ornamental design for the racket weighting device, as shown and described.
FIG. 1 is a top perspective view of the racket weighting device;
FIG. 2 is a reduced top perspective view thereof, the broken line showing of the racket is for illustrative purposes only and forms no part of the claimed design;
FIG. 3 is a top plan view of the bottom plate and post of the racket weighting device, for clarity of illustration;
FIG. 4 is a bottom view of the bottom plate and post of FIG. 3;
FIG. 5 is an elevational view of the bottom plate and post of FIG. 3;
FIG. 6 is top plan view of the top plate of the racket weighting device, for clarity of illustration;
FIG. 7 is a bottom view of the top plate of FIG. 6; and,
FIG. 8 is an elevational view of the top plate of FIG. 6.