The square is close to 90 degrees, but not spot on. I checked by taping paper to a workbench near the edge, drawing a line along the blade with the handle snugged up to the workbench, and then flipping the square to the opposite side and checking the edge against the pencil line. It was off by just a little bit--close enough for layout work, not close enough to square a table saw blade to a fence or a jointer fence to jointer tables. Probably as square as you can expect for the price.
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