Check it out.
But not only does it have both US and European needle sizing, handy for those of us with both sorts of needles,
(especially now that I have KnitPicks circulars in all those sizes!)
but what I didn’t realize until I actually received it, is that it has a 6 inch ruler with a magnifying strip that makes it ever so easy to measure gauge: here demonstrating that the talented Peruvian knitter who made my alpaca sweater, knitted it at a gauge of 7 stitches per inch (or 2.5 cm would be more correct, I suppose, in Peru).
The red bar is four inches long to make gauge measurement even easier.
Who knows? I might even start knitting more gauge swatches! (An outcome greatly to be desired.)
I certainly will be ordering another one of these — one for home and one for on-the-go, though it’s a bit big for my knitting notions bag. I just wish it came in its own carrying case, so as to protect the magnifying lens. But if that’s my only quibble, for $2.99, I think I can handle it.