The images and alignment are great, the only problem is the rule itself. I picked it up on eBay for about $16 dollars. It was grubby, with marks and scratches on the body. The plastic cursor was covered with very fine scratches and looked foggy. I was able to sorta fix that by rubbing toothpaste on it with a cloth (a tip I found in the ISRG archives), but I couldn't do anything about the small gouges.
The rule needed a good cleaning. It smelled like cigarette smoke, and there was a powdery residue that corroded one of the end pieces. The residue smelled like vomit. I'm convinced that at one time this was the "community slide rule" in some engineering frat house.