Musical instrument tuner

A frequency detection and display device powered only by mechanical vibration comprising:

• a body including a first section having a first thickness and a second section directly attached to the first section and having a second thickness different than the first thickness such that a vibration received by the body at a first predetermined frequency vibrates the second section at an amplitude different than an amplitude at which the vibration received by the body at the first predetermined frequency vibrates the first section thereby providing a visible indication corresponding to the first predetermined frequency,
• wherein the body further includes a third section having a third thickness and a fourth section directly attached to the third section and having a fourth thickness different than the third thickness such that a vibration received by the body at a second predetermined frequency vibrates the fourth section at an amplitude different than an amplitude at which the vibration received by the body at the second predetermined frequency vibrates the third section thereby providing a visible indication corresponding to the second predetermined frequency.