I’m working on setting up my dusted-off guitar and bass and for intonation I need a better quality tuner then the Korg GT-3 I have. Which ones will help with the intonation? One that shows how much any note is off, not just the one of the open string.
I’m not sure how helpful this is or what you’ve tried already, but I usually find it’s not that bad to do intonation by ear. Hit a 12th fret harmonic and then actually pluck a note on the 12th fret, and it’s usually easy for me to tell what direction things need to move. If your ear can’t tell the two pitches apart when they’re played one right after the other, you’re probably fine in terms of intonation unless something is really wrong with your instrument.