I make a lot of 12.5" blocks, so I use my 12.5" square ruler all the time to square up the blocks!
For me, I also need a really good, washable ironing board cover! I guess I am hard on them and I can't stand when they are dirty so I wash them a lot and these new ones just don't hold up in the washer! In fact, the last one I almost bought said DO NOT WASH! What??!!
You may want a few seam rippers! They get dull quickly and lost easily!