Metal tuning fork: the a440 tuning fork can delivers clear tone, longer sound and accurate tuning.; Violin tuner: its suitable for any instrument which can be tunable but most commonly used with stringed instruments.; Bass tuner: its suitable for any instrument which can be tunable, but most commonly used with stringed instruments.; Instrument tuning fork: absolute standard a-440hz tuning fork, sound sensing performance. soft shell case can better protect it from wearing out.; Tuning fork mallet: it's suitable for any instrument which can be tunable, but most commonly used with stringed instruments.

What's in the box
1 x Electronic Tuners