What's the size of your largest square ruler?

Hi all,
I'm working on a Disappearing 9 patch. Have been tempted to buy a larger ruler to square up my blocks but am wondering how much use I'd get out of it.
Thanks,
lots2do

Hi, lots. Mine is 12 1/2".

I have a 16 1/2" Creative Grids Square ruler. That's the biggest with measuring lines. I have larger size square rulers from 17 to 22 that I had the local glass shop cut for me. No lines but I drew an X from corner to corner.

12.5 and I couldn't do without it.

I bought 8.5 and am SO sorry I didn't get 12.5!
David

I have a 12 1/2" but I am going to have several others cut up to 24 1/2" :D:D:D

12.5

20 inch. i got it at Joann's online with a coupon. it has the measurements for side triangles and corner triangles if doing an on point lay out too.

I have seen a 24". Can't remember who made it. You could Google and look for it.

My largest square ruler is 15". Now that I see nativetexan found a 20" one at Joann's--I'll have to find that! The large ones are better for squaring up corners of quilts. Hubby gets upset when I use his carpenter's squares.