I claim the ornamental design for a laser level ruler, as shown.
FIG. 1 is a bottom plan view of a laser level ruler showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a right side elevation view thereof; and,
FIG. 6 is a left side elevation view thereof.
The portions of the laser level ruler that are shown in broken lines in FIGS. 2 through 5 are for illustrative purposes only and form no part of the claimed design.