Planet Waves PW-CT-12 NS Micro Headstock Tuner.
The NS Micro features a reversible multi-color display and metronome in a housing that blends in with the aesthetics of any instrument. It is small, convenient and accurate. It sits unobtrusively on the guitar’s headstock.
Calibration range 140 – 480.
Includes a visual metronome (20 – 270bpm).