The ornamental design for a samplevialgripper, as shown and described.
FIG. 1 is a top perspective view of a sample vial gripper showing my design;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a side view thereof;
FIG. 5 is an opposing side view thereof;
FIG. 6 is front view thereof;
FIG. 7 is a back view thereof; and,
FIG. 8 is a top view thereof in a state of use.
The broken lines shown in FIGS. 1-5 depict portions of the sample vial gripper that form no part of the claimed design. The additional broken lines shown in FIG. 8 depict environmental subject matter and form no part of the claimed design.