The ornamental design for a disdrometer, as shown and described.
FIG. 1 is a perspective view of a disdrometer;
FIG. 2 is a front view of the disdrometer of FIG. 1;
FIG. 3 is a back view of the disdrometer of FIG. 1;
FIG. 4 is a left side view of the disdrometer of FIG. 1, with the right side view of the disdrometer of FIG. 1 being a mirror image of the left side view;
FIG. 5 is a top view of the disdrometer of FIG. 1;
FIG. 6 is a bottom view of the disdrometer of FIG. 1;
FIG. 7 is a perspective view of a second embodiment of the disdrometer;
FIG. 8 is a front view of the disdrometer of FIG. 7;
FIG. 9 is a back view of the disdrometer of FIG. 7;
FIG. 10 is a left side view of the disdrometer, with the right side view of the disdrometer of FIG. 7 being a mirror image of the left side view;
FIG. 11 is a top view of the disdrometer of FIG. 7; and,
FIG. 12 is a bottom view of the disdrometer of FIG. 7.
The broken lines in the drawings are environmental structure and form no part of the claimed design.