Really nice and as impotent easy to use guitar tuner.
Get it here.
Features
- Tune to absolutely any note you want.
- None of the constraints of conventional tuning patterns.
- Highly accurate pitch detection.
- Simple and intuitive interface.
- Tune your guitar through any available sound input device including Microphone or Line In.
- Excellent tool for checking fret board intonation.
Checkout APtuner as well.