We claim the ornamental design for a saliva test device, as shown and described.
FIG. 1 is a front perspective view of a saliva test device according to an embodiment of the invention. The view for the adjacent front corner being a mirror image thereto.
FIG. 2 is a front elevational view of the saliva test device depicted in FIG. 1.
FIG. 3 is a rear elevational view of the saliva test device depicted in FIG. 1.
FIG. 4 is a right side view of the saliva test device depicted in FIG. 1.
FIG. 5 is a left side view of the saliva test device depicted in FIG. 1.
FIG. 6 is a top plan view of the saliva test device depicted in FIG. 1; and,
FIG. 7 is a bottom plan view of the saliva test device depicted in FIG. 1.
The broken lines represent unclaimed portions of the saliva test device and form no part of the claimed design.