Tuners SOLO S-320 Mechanical Metronome Universal for Guitar Violin Piano Musical Instrument Practice Tool FUniversal mechanical metronome suitable for most musical instruments, such as guitar, bass, piano, violin, drum, etc. Accurate rhythm, clear and loud sound, helping you improve your sense of beat and tempo, suitable for musical instrument beginners. Easy to use, wind it up first, then select your desired beat(2 3 4 6 0) and tempo(40 208 bpm), finally remove the cover and set the pendulum in motion. You can slide up or down the weight on the pendulum