Having taught thousands of quilters and seen every brand of ruler imaginable in use (not to mention having made quilts together for over 20 years
Square Up Ruler
Large Square Squared-Quilting Tool : Arts, Crafts & Sewing
Creative Grids Stripology Mini Quilt Ruler
Large Square Squared-Quilting Tool : Arts, Crafts & Sewing
Creative Grids Quilt Ruler 20-1/2in Square - CGR20 : Arts, Crafts & Sewing
Square Squared - Deb Tucker's Studio 180 Design
Quiltcut Strip Savvy Mini Square Up Slotted Quilting Ruler, QC3-MSU (8½ x 12)
Square Me Up Ruler - Backporch Design
Use the horizontal, vertical, and diagonal markings to square up any block – up to a 14-1/2 inch square. Use these lines to center and trim embroidery designs, applique blocks, and even fussy cut T-Shirts for T-Shirt quilts. (Fussy cutting is choosing a specific design in the fabric to showcase in your project.) The drilled holes at 1-1/2 to 13-1/2 inch increments, make it possible to square up, mark and add the seam allowance to any block.
Creative Grids Square It Up or Fussy Cut Square Quilt Ruler
Creative Grids 14-1/2in Square It Up or Fussy Cut Square Quilt Ruler - CGRSQ14