What do you mean by "perfect" intonation?

Sterner TM

 

A good human musical ear can apprehend a difference of  3 - 4 cents (1 cent = 1/100 semitone). between two notes. At three cents difference I can possibly notice that there is a difference, but I can't judge which one is higher or lower than the other.

I have a customer who can apprehend differences of 1.5 - 2 cents. He is blind since early age and his hearing is extremely developed. Since I've intonated his guitar, I know that I can intonate more accurate than the human ear can apprehend. That's what I mean when I use the word "perfect".

Copyright Anders Sterner
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