This is the best free tuner for Android. 
It works in all cases and uses the microphone for the best results.
It has a user-friendly interface that displays the information on the screen.
It is extremely accurate and reliable.
The user can select the range of the instrument.
The user can set the pitch of the note on the wheel.
It is a very useful tool for musicians and for people that want to learn how to play an instrument.

The interface of the application is pretty simple with direct and easy-to-use controls. Download this free app and get started with your music.