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gbj_tester
Unless you can do tenths of a mm it'll be pretty difficult. Borrow/buy a caliper and compare with some of these:
https://www.pillarspoke.com/aero
https://www.pillarspoke.com/psr-x-tra
https://www.pillarspoke.com/wing
etc. (there's a few possible categories...)
On the other hand why do you need to know? If you want to replace one, no one is going to notice a few tenths of a mm and/or gram here or there