The ornamental design for an externalfixationalignmentgauge, as shown and described.
FIG. 1 is a perspective view of an external fixation alignment gauge showing my new design.
FIG. 2 is a front view thereof.
FIG. 3 is a rear view thereof.
FIG. 4 is a left side elevational view thereof.
FIG. 5 is a right side elevational view thereof.
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines are directed to environment; the broken lines form no part of the claimed design. The broken break lines in the drawings indicate that the appearance of any portion of the article between the broken break lines forms no part of the claimed design.