AxeRig Clip-On Chromatic Guitar Tuner for Acoustic, Bass, 6 & 12 string Guitars, Banjo, Mandolin, Ukulele, Violin, Cello, Trumpet, Brass, Sax, Flute, Woodwinds - SPARE BATTERY Easiest to see & Easiest to use on Stage, in the Studio or at Home - Huge Note Indicator - Whole Display Background Lights up Green when in Tune - Best Professional Tuner & Great for Beginners & Students, too. Full 360 degree rotation for easy viewing from any angle Perfect Accuracy - Indicator won't jump all over like many do - Gives you perfect tuning every time - Works for setting bridge intonation using 12th-Fret Harmonics on All Guitars Batteries Always Included - FREE EXTRA Battery! One-button operation - nothing to set - works for EVERY note of every instrument, not limited to just the instrument you select, like most of the others. Durable & Reliable, will not break easily like others that have an arm & ball because Tune-It doesn't have the parts that break, yet still gives full 360 degree swivel rotation Lifetime Warranty - Unconditional - No Questions Asked