Yamaha QT-1 is a very precise metronome that uses a quartz crystal to generate a stable tempo. It can be used to provide a steady beat for practicing music or for setting the tempo of a recording. The QT-1 has a wide range of tempos, from 40 to 208 beats per minute, and it can be set to either a single beat or a double beat. The volume of the metronome can also be adjusted to suit your needs.

In addition to its use as a metronome, the QT-1 can also be used as a tuner. When used as a tuner, the QT-1 generates a reference tone at a frequency of 440 Hz. This tone can be used to tune your instrument to the correct pitch. The QT-1 is a very accurate tuner, and it can be used to tune your instrument to within 0.06% of the correct pitch.