D'Addario Chromatic Micro Soundhole Tuner

The D'Addario Chromatic Micro Soundhole Tuner mounts discreetly inside the soundhole of acoustic guitars and ukuleles, keeping it virtually invisible during performances while remaining easy to read with its multi-color display in any lighting. A highly sensitive piezo transducer reads vibrations directly through the soundboard, with a calibration range of 410–480 Hz to accommodate a wide variety of tuning standards.