I use calipers and a converion chart.
You could always buy a drill guage though.  
 Bill Fulling wrote: 
 
Hi folks,
Many years ago when I was in the Navy we were issued in our ET toolboxes a wire 
guage-it was about 2 1/2' in diameter and was used sort of like a spark plug 
gapper-was used to ID the AWG diameter of unknown wires(go-no go).Does anyone 
know if these are still available;I'd like to buy one.
73 de Bill W4NJF  
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