I only have a kitchen table for measuring / cutting fabrics, so there is often a lot of hangover and Fabric slides everywhere. This and my large carpenter's square not only measure and align, but also help hold the fabric in place. Also good for art projects when I need to line things up. Lines and numbers are very legible. In terms of accuracy, I haven't seen any issues with paper or fabric projects that require parts to be aligned, so the ones I got were aligned just fine. The line markings also match my tape measure.
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