I use Creative Grid rulers. Depending what I'm squaring up, sometimes I use the
12" square and sometimes I use a 6" x 24" and a 8" x 24" side by side. I like the
Creative Grids because it's clear and don't have all those yellow marks which
make it more difficult to see. No matter what ruler you use you will have to get
used to it. At first I wasn't sure if I liked the Creative Grids...I found them a little
confusing but because they were easier to see I kept using them until I got the
hang of it. Just have to double check how you place your rulers because they
1/2"...1 1/2"....2 1/2" on one side and 1"...2"...3" on the other side.
The Creative Grid is also non-slippery which is another plus for me.