Detecting Pitch From Audio Files

Hello

I've got a few measures of several guitar and bass audio files and one of them is slightly off pitch.

The pitch is so slightly off that when I solo each track I can't tell which track it is.

Is there a plug in that I can use that will help me determine which track is off pitch?

I can't recall if my tuner will work with recorded audio. :-( I'm done in the studio for the night.

Thanks

Or pan the tracks hard left/ right and use a midi piano for pitch reference. Solo each audio track until you here the offending note.