We claim the ornamental design for a cuvette, as shown and described.
FIG. 1 is an isometric view of a cuvette.
FIG. 2 is a right side elevational view of the cuvette depicted in FIG. 1.
FIG. 3 is a left side elevational view of the cuvette depicted in FIG. 1.
FIG. 4 is a top view of the cuvette depicted in FIG. 1.
FIG. 5 is a bottom view of the cuvette depicted in FIG. 1.
FIG. 6 is a back view of the cuvette depicted in FIG. 1; and,
FIG. 7 is a front view of the cuvette depicted in FIG. 1.
The broken lines and the unshaded areas bounded by broken lines and solid lines in FIG. 7 depict portions of the cuvette that form no part of the claimed design.