For those that need a reminder of the difference between accuracy and precision
I don't have perfect pitch. For those who do, how accurately and precisely can you recognise, say 440Hz for an A.
(1) You can hear a note, and say that it is nearer to an A than to some other nearby note
(2) You could tune a piano to perfect concert pitch without any reference to any outside measure of frequency whatsoever.
(3) You can distinguish perfectly between different keyboard temperaments and say from hearing a single scale, the temperament the instrument is tuned in.
(4) Someone could play you a pure frequency on an oscillator, tell you the precise frequency in Hz and you would be able to identify and reproduce that precise frequency to within 1Hz for the rest of your life.
I realise that abilities differ but I'm trying to get a general understanding of what is possible and how finely the ability can be honed.