The combined square is pretty accurate. but a missed opportunity for many reasons. My calipers match the marks, so points for that. but the ruler is not 1 inch in diameter (it measures 0.967 inches) and does not follow the useful convention for reversed pages. It gets the correct metric side (in my opinion) since both sides start at 0 at one end; So you can flip it and take measurements on either end of your project, but the imperial side doesn't, so you have to count down to do the same. Mine is clamped correctly so there are no problems. Carpenter Square is not very accurate. Marker is defective and incompatible. It's heavy, but the powder coating is so thick I can't rely on the edge staying straight. Also, the base plate isn't 1/8" thick, so you can't use it as a standing ruler either. Either way, it's not easy. For the price, I guess I expected better.
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