Planet Waves PW-CT-12 NS Micro Headstock Tuner.
The NS Micro has a reversible multi-colour display and a metronome in a housing that blends in with the aesthetics of any instrument. It is small, comfortable and precise. It is very discreetly placed on the guitar neck.
Calibration range 140 - 480.
Includes a visual metronome (20 - 270bpm).