Get This Tuner
There are a few pros to having a tuner like this, for one its easy , second it works great, third it teaches a lot and last but not least its dynamic so it works with pretty much every instrument, even vocals.
P.S its totally free , I want to buy the app anyway just to show my respects to the engineers behind it.
JoleoG about
Pano Tuner Lite, v1.2.14