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The Korg CA-30 is an accurate pocket-size chromatic tuner with an outstanding price! It operates from 32Hz to 4186 Hz (C1 to C8), and is designed for tuning guitars, basses, keyboards and more. It features an LCD "needle" display for stability, with easy-to-read LED pitch variation indicator lights. It can be calibrated for a variety of concert pitches, and also has a memory backup function.