on my tuner...some pretty cheap one...u can select the keys in which you tune in...which one do i use for standard tuning?

there's C F Bb Eb

they all make the guitar different pitched....

thats not what i meant. there's these scales i haveto choose in order to tune the guitar. ive usually been using the C...i dno why, just seemed right, but is it?
I'm not entirely sure what you mean, so hopefully someone else will come along who does! Sorry.
So why is that then? I mean... all the notes in standard tuning are in C, and I suppose the notes in those other choices aren't... is that it?