Planet Waves Soundhole Tuner
The PW-CT-15 NS Micro Soundhole Tuner from Planet Waves provides fast and accurate chromatic tuning, while remaining inconspicuously hidden in your instrument's soundhole via a non-marring mounting clip. This handy tuner is a breeze to use, on account of its easy-to-read, multicolor display. Useful for acoustic guitars, ukuleles, and many other acoustic instruments. You'll want one for every acoustic instrument you own!