I have to agree with ken, as far a needing to balence props up to 14" most commercial props are real close in there balence properties, I check to see if the props I have are not totaly out of wack, but unless there is some dammage thats obvious to the eye then your prop is most likely good to go,a word to the wise props don't break that are a little out of balance unless there is a fatal flaw in them, then balanced or not there going to fail no matter what.
if you throw a prop on your balancer and its really out then don't use it, simple as that.
most props are close enough, but its always good to check them just to get used to using the balancer you spent 20$ on