An electronic tuner is a device used by musicians to detect and display the pitch of notes played on musical instruments. The simplest tuners use LED lights or a needle to indicate approximately whether the pitch of the note played is lower, higher, or approximately equal to the desired pitch. More complex and expensive tuners indicate more precisely the difference between offered note and desired pitch.Tuners vary in size from units that can fit in a pocket to table-top models or 19" rack-mount units. The more complex and expensive units are used by instrument technicians, piano tuners and luthiers.The simplest tuners only detect and display the tuning for a single pitch (often "A" or "E") or for a small number of pitches, such as the six pitches used in the standard tuning of a guitar (E,A,D,G,B,E).
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