Zen Knitting

There are special graphs you can buy at craft supply stores that are specifically for measuring crochet or knitting needles and their hooks. Don’t confuse them with thread/yarn measuring graphs though.

There is a device you can get at the shops (crafts stores, yarn stores) that has holes to put the handle into and it will tell you the size. It works for both crochet hooks and knitting needles. A picture of it is in the link below, but you don’t have to order from that source – just look for it in the store, I have them in different colours, which seems to not matter.