Appmuse

Fine Bass Tuner is a chromatic tuner designed for bass instruments that allows you to quickly and accurately tune your instrument using the built-in mic. Features nice and clean interface allowing you to quickly find your pitch. Disable “Use ambient noise reduction” from system sound settings for better microphone sensitivity. The Fine Bass Tuner uses a different algorithm that was created specially for bass. If you are not bass player please check my Fine Chromatic Tuner app. 
The working range is the 20 Hz - 350 Hz. It is designed to give the most accurate tuning for the low frequencies and your bass guitar or other bass instrument will sound just in the right way. 
Features: - Automatic note selection
 - Ultra responsive -50 to +50 cent range fine tuning display 
- Precise to ±1/100 semitone (±1 cent) 
 - Analog like needle 
 - Exact frequency display. 
- Keep screen on while working. 
- Works in noisy surroundings
 - Adjusted for bass (20 - 350Hz range) 
- String vibration animation