Guitar Tuner Pro is a tuner for string instruments. It currently supported Guitar, Bass, Ukulele, Violin, Cello and Banjo. For each instrument, there are several tuning type to choose including the standard tuning and alternative tuning. It's easy to use and light weight for instrument learner. Notice that it's better to use an app in a quiet place to avoid the sound perturbation.- Support guitar, bass, ukulele, violin, cello, banjo- Support standard and alternative tuning- Graphic UI makes the app easy to learn- Customizable metronome