The ornamental design for pipettes, as shown and described.
FIG. 1 is a front view of an embodiment of a pipette according to the claimed design;
FIG. 2 is a perspective view of the pipette of FIG. 1;
FIG. 3 is a top plan view of the pipette of FIG. 1;
FIG. 4 is a front view of an embodiment of a pipette according to the claimed design.
FIG. 5 is a perspective view of the pipette of FIG. 4; and,
FIG. 6 is a top plan view of the pipette of FIG. 4.
The features shown in broken lines are only for environment or illustrative purposes and not part of the claimed design. The left, right, and back sides of pipettes are identical to the front view and are not shown.