All needle gauges are not created equal. An addi® Needle Gauge is a must have when you work with addi® needles!
Black Square Style: A handy 2"x2" size made of hard plastic with a convenient 2" stitch gauge finder on top.
Red Heart Style: About 3"x3" with cut out sizers that work well for crochet hooks as well as knitting needles.
These gauges will work best with addi® needles, as they are designed to exact metric sizes. Other needle brands that are manufactured to US sizes or with less precision may not gauge correctly on this tool.