Originally Posted by judy_68
Mine are different brands. I have bought them all on sale or at a garage sale or flea market. Im cheap. I have never had any problem with any of them but I have one that doesn't seem to be as straight anymore.
Judy in Ohio
If you've used it a lot, put it against something straight - a bow/curve/arc may have been worn/eroded into the ruler.
That happened to a couple of mine. Couldn't figure out why I had a curve in the fabric when I moved the ruler. Cuz the ruler had a curve in it. It wasn't much - maybe 1/16 of an inch, but it bugged me.
I've tried stacking my rulers on top of each other to compare markings. Usually they match - once in a while they don't.