Large Knitter's Gauge
A Knitter's Gauge with Yarn Cutter has several functions. It is used to determine the size of a knitting needle/crochet hook that have no size identification. It has a ruler to help with measurements. It is used to check the tension of the knitted swatch. The handy sharp blade provided is to help cut the yarn, instead of a pair of scissors.
This large knitter's gauge can measure needles from 11mm and 25mm.