TinyTuner CT-20 Clip-on All Instrument Chromatic Tuner with Metronome Tunes most instruments (chromatic tuner). A sample of the instruments it can tune: Bass, Bassoon, Cello, Clarinet, Euphonium, Flute, French Horn, Guitar, Harp, Oboe, Piccolo, Saxophone, Timpani, Trombone, Trumpet, Tuba, Viola, Violin & many more! Bright blue display screen turns green when in tune Small, compact size & elegant design Clip on tuning so it tunes in noisy environments Lots of features: Pitch Calibration, Display metronome, Transpose, Clip & Mic modes