ChiaoGoo Swatch and Needle Gauge

Made of durable plastic, this is a 3 inch (7.5 cm) swatch gauge with a needle gauge for US needle sizes 2, 2.5, 3, 4, 5, 6, 7, 8, 9, 10, 10.5, 11, 13, and 15.  Corresponding gauge on the reverse side for swatch gauge in centimeters along with needle sizes in millimeter: 2.75, 3.0, 3.25, 3.5, 3.75, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 8.0, 9.0, and 10.0mm.