Fabric.com Measuring Tool
Handiest tool ever!
I love this little tool and use it almost daily. I sew a lot of patterns that don't have their seam allowances included. This little tool makes it so easy to add whichever seam allowance you like, and it takes up almost no space.
You can read more about my sewing projects on my blog, A Few Threads Loose:
January 1, 2013