This is not usable, The needle is going crazy-town.

The needle is going crazy. It’s all over the place, jumping like a drug addict that desperately needs a shot from C to B to E#, left right, left middle, left… man that’s tiring on the eyes.
Adjusting the noise-gate level does not seem to help.
Even more, you shouldn’t have to noise-gate anything or guess any setting whatsoever to make this work, the app should be able to guess that automatically !
Remember buying a chromatic tuner from the store ? you just put in a 9V battery, turned it ON and it worked flawlessly up-front, right ?

Not worth buying.

Ben Rhayader about TurboTuner - Chromatic Tuner for Guitar, Bass and more, v1.0