This is a chromatic polyphonic tuner for guitar and other string instruments.
Free version measure string and single chord ( standard 6 string guitar )
Additional USB-module has line input for electric instruments
Module error :
1 string - 0.125 cent
Chord - 1 cent
Free version error = 1 cent in all modes
Buttons for each string in chord were added
User can change detection mode in 1 click
Tested on tablet with Android 4.2 and 512 RAM
Evaluation period will expire on January 1, 2019
and apllication will stop working