D'Addario Accessories - Micro Clip-Free Tuner

Clip Free mount screws directly into 1 tuning machine screw hole.
No additional holes needed and the necessary screw is included
Built-in piezo transducer picks up instrument ™s vibration rather than sound
Tri-color reversible backlit LCD screen makes it easy to tune in dark environments while allowing mounting in front or behind headstock
Wide calibration range (410Hz to 480Hz)
Tunes acoustic and electric guitars, basses, mandolins, banjos and other stringed instruments