This tool is practical and easy to use. Depending tuner, it is satisfying, provides for a violin, and work the correctness note by note. With two caveats though: is not stable in the register on-acute (from mid-acute on the violin, three extra strokes above the range). This is rather annoying since correctness needs to be worked specifically in this register on-acute. A tip of work to overcome this drawback: working correctness octave lower with control of the tuner, and keeping in auditory memory note or chip worked melody, play one octave higher with control by ear. Second reserve (lower) does not distinguish the enharmonic (C sharp consistently indicates to D flat, etc.) while significantly there a difference (coma 1/9 tone). That is significant in violin, if you want to work thoroughly accuracy. Calibration mode very useful tuner (set the LA 440, or 442 etc., or downright lowest baroque music).
Not really need the tool "his" or "agreement with the third."
Practice the little light, because without it we do not quite see the needle of the screen with the camera on a desk.
Metronome function: you can choose to pay per Unit (record shows "not in full") at 120, 121, 122 etc. It is necessary to work a piece on a given tempo, eg if 120 would be a bit too slow and too fast 124 (not a mechanical metronome). You can adjust the volume of the metronome beep. At maximum, it is not that hard, it's a little weak, when we play a strong passage, or the strong one plays several quartets for example, or with a piano. Finally, to be demanding, the beep is not very nice, it would have been nice to have another sound, for example closer to the ticking of a mechanical metronome. SF