How to tell what size your hook is

[PurpleDaffodil]

.... when the hook has no label on it. At some point I needed a specific size hook and the only one i could find was plastic. Now I have it with no label I forget what size it is. It doesn't even have a brand on it.

[magiccrochetfan]

there is a handy tool for this, the Knitchek http://www.amazon.com/gp/product/B0001DS84G

it gives the mm, as well as crochet hook and knitting needle sizes.

you can probably find it at Walmart, Hobby Lobby, Joanns etc. there are other versions also that you might find at an LYS.