I don’t knit but like, everyone else on the planet seems to. What better way to check the gauge of your needles than to stab a dude? There should be a girlie option too and maybe they could come as a pack so that you can stab the correct gender when you need to.
It measures 10 gauges:
2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm