Works great!

I use this for my guitar, bass, and ukulele. Works well, picks up the sound of the instrument over the sound of my kids. I can set the machine for my specific instrument. It all works flawlessly.
I used this when it was just for iPhone but with an ipad GUI its nicer on my device. Kudos.

Annchan1 about Pro Guitar Tuner, v1.0.3