Hi Everyone,
I’m a knitting newbie. I have inherited a lot of circular needles from my mother. How do I identify the size they are? I’m looking all over the needles but don’t see any numbers. I’m sure my mom knew exactly what each one was. But I have no idea. Thank you in advance! 
There are sizers like this, http://www.knitpicks.com/accessories/View_Sizer__D80306.html
Thank you!!
This is the sizer I use. To measure length you measure from needle tip to needle tip.