The ornamental design for a straight edgeruler, as shown.
FIG. 1 is a partial top view of a straight edge ruler showing my new design; and,
FIG. 2 is a partial perspective view thereof.
The bottom of the straight edge ruler is the same as the top of the ruler.
My straight edge ruler is characterized by a repetitive saw tooth design on one edge that goes through the under-side, along with a series of round holes, making both sides of the ruler identical.