gStrings is a chromatic tuner application measuring sound pitch and intensity.It will let you tune any musical instrument (violin, viola, violoncello, bass, guitar, piano, wind instruments, your own voice/singing).Features include:
1. multiple built-in instruments and tunings,
2. support for user-defined custom tunings,
3. a long list of built-in temperaments (just, pythagorean, meantone, comma, etc.),
4. support for user-defined custom temperaments,
5. orchestra tuning (shifting/redefining tone frequencies),
6. pitch pipe,
and many more.If you were looking for a guitar tuner, try it!(*) the INTERNET permission is used for ads only.(**) most of the historic temperaments were included courtesy of NetCat AG.

// Option A //

To download Tuner - gStrings mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download Tuner - gStrings mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download Tuner - gStrings from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Tuner - gStrings in HappyMod App.