The ornamental design for a probesheath, as shown and described.
FIG. 1 is a perspective view of a probe sheath depicting the new design;
FIG. 2 is a side view thereof;
FIG. 3 is an opposite side view thereof;
FIG. 4 is an end view thereof;
FIG. 5 is an opposite end view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken line portions of the figures show unclaimed subject matter only and form no part of the claimed designs. The dot-dash lines represent boundaries of the claimed designs which do not form a part of the claimed designs.