These handy square tools are used for measuring gauge swatches knit or crocheted in any type of yarn.
Katrinkles is based in Rhode Island so if you're in the USA and aren't ordering other items from us I recommend ordering directly from Katrinkles so they aren't crossing the Atlantic multiple times.
Simply hold the tool up against your work and count how many stitches fit inside the cut out square (along the bottom for stitch gauge and up the side for row gauge). The bottom measurements are in inches and centimeters are marked on the left side, making this ruler universal for all fiber artists.
This precise gauge swatch measurement tool is laser cut from bamboo and is available in two sizes. The smaller measures approximately 2.5" x 2.5" x 1/8" with a 2" / 5cm square cut out and the larger measures approximately 5.5" x 5.5" x 1/8" with a 4" / 10cm square cut out.