Music Tuner is a tool to tune instruments, detect frequency of any sounds, and show notations directly on the staff.
It can support full range notes, from C0 to C8.
It contains some standard instruments template, including guitar, bass guitar, ukulele, pipa, violin, viola and cello.
Also this app contains a metronome with accurate tempo from 20bpm to 200bpm, selected from 2/4, 3/4 and 4/4.
Even you can use both tuner and metronome at the same time.