A true multipurpose tool!
This sturdy, white resin laser-cut gauge is used to determine your swatch gauge and help measure your needle sizes.
Simply place the tool on your swatch and count how many stitches/rows fit inside the cut-outs (along the bottom for stitch gauge and up the side for the row gauge.)
In addition, there are handy conversion charts and yarn standards tables for reference. The tool is double-sided for US/knitting vs. metric/crochet differentiation.

Front Side: Knitting Needle Conversion Chart. Types of yarn and recommended needle size.
Back Side: Crochet Hook Conversion Chart. Types of yarn and recommended hook size.

Measures approximately 5.5" (14 cm) square.

CHIAOGOO KNITTING TOOL