A multi-purpose tool for knitting and crochet. Measure your crochet hook or knitting needle size in US, metric and Japanese standard sizes. The Swatch Ruler allows you to isolate a section of your work to easily count both stitches and rows. Includes: Knitting Needle Gauge, Crochet Hook Gauge and Swatch Ruler. Just place the shaft of your knitting needle or crochet hook in the groove that best fits to check your needle/hook size or get an accurate stitch gauge measurement with the 4in (10cm) gauge rulers.