The ornamental design for a portable testinstrument, as shown and described.
The patent or application file contains a least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is a top front perspective view of a portable test instrument showing the new design;
FIG. 2 is a bottom rear perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left-side elevation view thereof;
FIG. 6 is a right-side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines represented as dot-dash lines, crossing the article in all views, depict break lines which form no part of the claimed design. The appearance of any portion of the article between the dot-dash lines forms no part of the claimed design.