It's a line, nothing more, nothing less. It seems to be of decent quality, seems to measure correctly and looks straight. Quite easy. My only complaint is that this ruler is definitely not completely straight. I used it to draw a straight line and found that the inch side of the ruler curved outward and the centimeter side curved inward. The curve is very thin and probably not noticeable or important for the vast majority of projects. But this is something to be aware of. If you want something really straight, you'll have to shell out for a good steel ruler.
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