Tuner App For Android Devices

gStrings is a chromatic tuner application for android. It will let you tune any musical instrument, such as the violin, viola, violoncello, bass, guitar, piano and wind instruments. Its free as in free beer, available for download through the android market.

Also here’s the creators web site: http://www.cohortor.org/gstrings/Documentation.html

I’ve been using it and its as good as my KORG TM-40 tuner. Handy for when I'm out and want to insure my pitch is right.