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Rocktuner RTT3 Digital Chromatic Tuner (black)
This little tuner is all you need to tune a steel guitar. Its accuracy is ±1 cent (better than the human ear). Runs on 2 AAA batteries (included). A "Key" button is provided for tuning reeds and horns in different keys (C, F, Bb, Eb) with the built-in microphone. For steel guitar, just leave it on C and plug into the input jack. Simple and easy.