The Sabine Zoid chromatic tuner allows you to easily tune your guitar, bass, or most other stringed instruments. There are two tuning modes. Clip it on your instrument for use in noisy rooms, or use the built-in mic in quiet rooms. A green LED shows if your string is in tune. A red LED shows you are off, and a needle gauge shows if you are sharp or flat. The Sabine Zoid has a seven-octave tuning range, so you can tune almost any stringed instrument with it. The Guitar Center has the Sabine Zoid for $29.99
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