The ornamental design for a haptonomicinstrument for testing the feel of articles made of plastic, as shown and described.
FIG. 1 is a perspective view of a haptonomic instrument for testing the
feel of articles made of plastic, showing my new design from the top, rear
and left side;
FIG. 2 is a right side elevational view thereof, the left side being a
mirror image thereof;
FIG. 3 is a top plan view thereof, the bottom being a mirror image thereof;
FIG. 4 is a perspective view thereof from the front and top; and,