Where can I find a device to measure wire gauges?

Ive seen thing that was a big metal ring with slots in it that have the sizes of wire gauges, but cant seem to find one for myself. Does anybody know what they are called or where I can get one?

Answer:
http://www.mcmaster.com/

type in " wire gauges" or 19305A34 (51.00) or 19305A33 (18.00 bucks)

They're the best they will be sure to ship it off next day. I have never had a problem with them.

enco below has it for 16.20. They're good but not the fastest shippers.

What about a thickness gauge ? this one happens to be on sale for 50.00 If you need to be within .001 it's the only way to go.
Usually a good hardware store will have what they call a guage class, measures most guages of wire. If that doesnt work, some of the better wire strippers also have a guage class on them too.
Try this one.

Model GEN-20 - For gaging non-ferrous wire and metal such as copper, brass, aluminum, etc. Heavy gage hardened and tempered tool steel. 3 1/4" diameter; 1/8" thick. Front face shows the gage sizes. The back shows decimal equivalents adjacent to each slot.
If you live near a home depot go there.

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