
This metronome (10 to 250 BPM) includes a tuner; you can set the tempo, rhythm and notes per measure from 1 to 9. The tuner emits reference pitches for any of the 12 notes in an octave from A to G#.
Links:
[1] http://www.maclife.com/article/reviews/small_orange_metronome
[2] http://www.maclife.com/article/guitar_hero_iii_legends_of_rock
[3] http://www.maclife.com/article/guitar_pro_5
[4] http://www.maclife.com/article/optek_music_systems_fretlight_fg_431_vintage_electric_guitar
[5] http://www.asmallorange.com/products/metronome/