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Chiaogoo 3" x 3" Swatch and Needle Gauge is a multi-purpose tool used to help determine gauge and measure your needle/hook sizes. In addition, there are handy conversion charts and yarn standards tables for reference. Simply place the tool on your swatch and count how many stitches/rows fit inside the cutouts. The tool is double-sided for US/Metric and knitting/crochet differentiation.