The ornamental design for a seartool, as shown and described.
FIG. 1 is a top perspective view of an embodiment of a sear tool;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a right view thereof;
FIG. 5 is a left view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken dashed lines show various portions and other elements in the Figures for the purpose of illustrating unclaimed portions and form no part of the claimed design.