I have way to many rulers but if they could make a non slip one it would be great. I have used at least 3 different non slip tools but none really work that well. I have used the clear plastic, sandpaper disks, clear plastic disks, and none are that good.
My favorite ruler is Quilt in a Days triangle square up ruler, it is revolutionary for HST.
I just bought a kalidescope ruler. I have the shape cutter and the X blocks rulers that I have never even used.
I bought the 1/2 in rulers and like them but they are hard to hold in place to mark the pencil line.
I have the Fun and Done rulers, the square in a square ruler and many more, these are just the exotic ones.
How about a ruler to square up quilts?
Right now I use my 16 in. square up ruler.