Great tuner

This is exactly what you need for just about any stringed instrument. I love the way it is optimized for strings and lets you customize any number o strings and any tuning for each string. I have no stability problems with this on my iPhone 4S and ios 6.1. I use this to time my violin in record time. The only suggestion I would make is adding preset tunings for classical instruments. While the violin shares mandolin tuning, it would be nice to see preset tunings for violin, viola, cello and double bass.

Jorgeee! about Pro Tuner