B0167VYWW2 Korg SHCS100 Sledgehammer Custom 100 Clip On Guitar and Bass Tuner

Amazing battery life of approximately 100 hours
Ultra-high tuning accuracy of +/- 0.1 cents
3D visual meter creates a revolutionary visual effect with three meter display modes
A clip mechanism that provides strong holding power as well as flexibility
Calibration, auto power-off, and memory backup functions