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The gray strip running down the center is actually a channel cut in the backside of the ruler. It butts against the seam allowance and is supposed to be more accurate than traditional rulers because it doesn't wobble because of the bulk of the seam. I like the idea and use it for the first cut, but the measurement lines aren't quite where I would expect them to be for the second cut. If the lines are a thread past the outer edge of the block, then the final square measures true according to my other rulers. :-)
If you've used this ruler (an Australian import), let me know what you think.
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