Every knitter should have one! A useful accessory for measuring needle sizes and tension gauge.
Measures needles from 2mm to 12mm (US 0 to US 17). Also includes a 6" (14.5cm) ruler, and see-through & magnified section for counting stitches and rows, especially for a 4" / 10cm tension square Size - 21/4" x 61/2" (55mm x 160mm)