LTune is a lightweight and handy app and is perfect for your instrument.
You set your standard instrument and gives the tuning note to note in an intuitive interface. Even if your instrument is not listed the tuner is still a powerful tool working in a wide range of notes.
The tuning fork is designed for those who want greater control in the generated notes running from 1st to 8th octave. It can also be an option for advanced tuning. You can still change the middle A note (A4) in the definition of the standard instrument, between 410 and 470 Hz reaching adjustments of all kinds.
The Metronome is easy to use, intuitive you can adjust the time between 20 and 200bpm. It also has the silent vibrator for night studies and flashlight mode for noisy environments.