An usefull metronome with unique Tempo Tap feature in the setup page.
Enjoy your music!
From wikipedia:
Galileo Galilei first studied and discovered concepts involving the pendulum in the late 1500s and early 1600s. About two centuries later, Etieune Loulie first successfully used an adjustable pendulum in the construction the first mechanical metronome, however his design did not include an escapement with which to keep the pendulum in motion.
The more familiar mechanical metronome was invented by Dietrich Nikolaus Winkel in Amsterdam in 1812. Through questionable practice, Johann Mälzel incorporated Winkels ideas started manufacturing "Maelzels" Metronome in 1816. Ludwig van Beethoven was the first notable composer to indicate specific metronome markings in his music, in 1817.
Usage
Metronomes may be used by musicians when practicing in order to maintain a constant tempo; by adjusting the metronome, facility can be achieved at varying tempi. Even in pieces that do not require a strictly constant tempo (such as in the case of rubato), a metronome "marking" is sometimes given by the composer to give an indication of the general tempo intended, found in the score at the beginning of a piece or movement thereof.
Tempo is most always measured in beats per minute (BPM); metronomes can be set to variable tempi, usually ranging from 40 to 208 BPM; another marking denoting metronome tempi is M.M., or Mälzels Metronome.