Let's start with a square. The tolerance is better than 0.002 inch. Didn't look again. My guess is that it's better than 0.001 inch. In short, it's far better than what woodworking requires. Note that wood can easily move more than 0.003 inches in one night, or more than 0.01 inches in a month. Also, it's heavy, so it needs to stay flat. The exit is okay. No corners and edges or the like. Cons - I wish I had the box with the square but can't complain at this price point (paid $40).
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