Snark SN-5X Clip on Multi-Purpose Tuner: Click for more info
The Original Clip on Tuner! Chromatic Tuner for Acoustic and Electric Guitar, Bass & Violin.
Faster Chip, Brighter, Full Colour Display
Place it anywhere on front or back of headstock (no dead spots)
Display Rotates 360 Degrees (works for right or left handed players)
Stay Put Clip - Fast and Deadly Accurate - Guitar, Bass & Violin Tuner