DM Quilting Basic Marking Tools - Two sizes available. 4"x12" and 12" x 12"
The only way to be accurate is marking in a slot not to the side of a ruler.
Marking slots will accept several brands of markers, pens and chalk liners.
Slots are spaced at 1″ increments with 1/4″ lines between them.
Diagonal lines aid in angled placement.
Two edges of the tool show measurements 0-12″ and two side have Center indicators of 0-6″ in each direction for precision alignment.