The ornamental design for a yarntesting apparatus, as shown and described.
The application file contains eight (8) drawing executed in color. Copies of this patent application publication with color drawings will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is front perspective view of the yarn testing apparatus of our new design;
FIG. 2 is a rear perspective view of the yarn testing apparatus of our new design;
FIG. 3 is a front plan view of the yarn testing apparatus of our new design;
FIG. 4 is a rear plan view of the yarn testing apparatus of our new design;
FIG. 5 is a top plan view of the yarn testing apparatus of our new design;
FIG. 6 is a bottom plan view of the yarn testing apparatus of our new design;
FIG. 7 is a left side view of the yarn testing apparatus of our new design; and,
FIG. 8 is a right side view of the yarn testing apparatus of our new design.