Attmu Guitar Tuner, Clip-on Tuner for Guitar, Bass and Violin, Super Tight Instrument Tuner With stay put clip, display rotates 360 degrees for easy viewing. Attmu clip on all instrument tuner features frequency range tailored for guitar and bass,etc. Feature, pitch calibration (440Hz). Attmu tuner for guitar, bass and violin ukulele is simple for beginners. Pitch calibration and transpose features.