We claim the ornamental design for a concentrating pipette, as shown and described.
FIG. 1 is a perspective view of a concentrating pipette according to an embodiment of the invention.
FIG. 2 is a front elevational view of the concentrating pipette depicted in FIG. 1.
FIG. 3 is a side elevational view of the concentrating pipette depicted in FIG. 1.
FIG. 4 is a back elevational view of the concentrating pipette depicted in FIG. 1.
FIG. 5 is a top plan view of the concentrating pipette depicted in FIG. 1; and,
FIG. 6 is a bottom plan view of the concentrating pipette depicted in FIG. 1.
The broken lines in the drawing views are included for the purpose of illustrating portions of the concentrating pipette that form no part of the claimed design.