The ornamental design for a vibrometer for personaldigitalassistant, as shown and described.
FIG. 1 is a rear perspective view of a vibrometer for personal digital assistant showing our new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a right side view thereof; and,
FIG. 6 is a left side view thereof.
The features shown in broken lines in the drawings depict environmental subject matter only and form no part of the claimed design. The dash-dotted lines in FIG. 1 and FIG. 2 denote the boundary of the claim and form no part of the claimed design.