MY FAVORITE 6 1/2" SQUARING UP RULER
 
Gridded using the same symbols as our large rulers, but also with a shadow that follows every inch mark, turns a corner and connections, making it easy to see squares. There is one 45-degree diagonal line to help square up half-square triangle units. The last 1/4in is great for checking seam allowance.
 
Color: Clear
Made of: Acrylic
Size: 6.5in x 6.5in