The ornamental design for a viallabmulti-reader, as shown and described.
FIG. 1 is a perspective view of a vial lab multi-reader;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right-side elevational view thereof;
FIG. 5 is a left-side elevational view thereof;
FIG. 6 is a top elevational view thereof; and,
FIG. 7 is a bottom elevational view thereof.
The broken line showing possible labeling and is included for the purpose of illustrating environmental structure and forms no part of the claimed design.