Fender Bullet Clip-On Headstock Tuner Black

From Fender:

Built with live performance reliability and aesthetic in mind, the Bullet Tuner provides a nonintrusive, staunchly accurate tool for musicians at every stage. A powerful engine with a noise-proof vibration sensor allows for precise chromatic tuning for electric, acoustic and bass guitar players alikewhile a bright, color LED screen shows easy-to-see readings in any environment.

• Vibration-based tuning system
• LED color screen
• Strong clamp
• 10 minute auto sleep mode to preserve battery life
• Click the power button twice to wake up
• Tuning range: A (27.5Hz)C (4186.0Hz)
• Precision: +/- 1 cent
• A4 range: 440Hz
• Power supply: 1.5V (LR44) lithium battery (included)
• Dimensions: 36.6mm x 14mm x 38.8mm, Weight: 13.5g