how to measure carbs?

norcal ex

X-H2
Location
San Jose, CA
how do yo umeasure carbs to tell what size they are? i just bought soma nd they are suppose to be 38s but the little number inside says 34 and when i measure them it says 34 (on the smalles part of the hole) and at the opening is 38mm. but when i do the same for my single wetjet carb , the smalles part is 44 and the opening for the carb is 46...so what is it? did i get 34s instead of 38s?
 
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