could anyone tell me ?

[Sandmaniac]

What is the correct way to measure a coin or medallion to determine it's size ?

 

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[wesfrye53]

I yield my time to the knowledgeable and ever correct "PBK"!

(Sorry Gypsy...forgive me?)

 

[PBK]

Er... metric calipers? If you're really serious about it, you can buy calipers made just for that purpose:

http://www.brent-krueger.com/caliper.html

If you've got access to a copy of the Standard Catalog of World Coins, it's got a handy "Chart of Coin Sizes by Millimeter" with circles ranging all the way from 10 mm up to 79 mm, along with a ruled scale of 24 cm.

Me? I'm lazy and just slap 'em alongside a ruler to check the diameter.

 

[Sandmaniac]

That's what I thought,
This is an actual size millmeter ruler that I added to my favorites,
Does this work?

http://155.44.225.28/science/hmxs/ps/pdf/4rs_3_2-4.pdf

 

[PBK]

Don't see why not, provided the pic or printout is indeed actual size.

By the way, I forgot to mention that you can pick up plastic vernier calipers for around $2-3. They're intended for student rather than professional use, but will still get the job done.