Electronic tuner
An Electronic tuner is a device used by musicians to tune instruments. A musician plays a note, and a display (a needle, an LCD simulated needle, or LED lights) tells the musician whether the pitch of that note is lower, higher, or approximately equal to the desired pitch. Some models try to automatically detect which pitch is intended, others require the musician to specify the target pitch, and others allow the user to choose between these two modes. Some models allow the user to select reference pitches other than A440. Most electronic tuners only allow tuning to an equal temperament scale.
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