Fine Bass Tuner uses a different algorithms for accurate pitch detection of very low frequencies (That is where other tuners fail). It's working range is 20 Hz - 350 Hz

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 in your device. Features nice and clean interface allowing you to quickly find your pitch.
The Fine Bass Tuner is a version of my Fine Chromatic Tuner that was adjusted and designed for bass .
I believe that it will work with any low to mid range instrument as it was fine adjusted for the 20 Hz - 350 Hz.

This is automatic chromatic tuner that supports every screen size. Fine Bass Tuner works well with devices supporting 48000 32 bit audio input to 22050 16 bit audio input. It still works with the other possible settings but not so accurate. If you are a bass guitar player you will find this to be the best bass guitar tuner free app. 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.