The ornamental design for a pipette, as shown and described.
FIG. 1 is a front view of a pipette according to the present design;
FIG. 2 is an enlarged scale rear view thereof;
FIG. 3 is a side view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a front perspective view thereof; and,
FIG. 6 is a rear perspective view thereof.
FIGS. 5 and 6 show a tip portion of the pipette rotated relative to a housing of the pipette as compared to the position of the tip portion in FIGS. 1–4 indicating the ability of the tip portion to rotate relative to the housing.