My Favorite Squaring Up 6 1/2in Ruler
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Michell Marketing Quilt Patterns
Gridded using the same symbols as the large rulers, but also with a shadow that follows every inch mark, turns a corner and connections, making it easy to see squares. There is one 45-degree diagonal line to help square up half-square triangle units. The last 1/4-inch is great for checking seam allowance.