Monoprice 611210 Clip On Guitar Tuner - Black With Adjustable A4 Frequency And Five Tuning Modes: Guitar, Bass, Violin, Ukulele, And Chromatic Includes tuning modes for tuning Guitar, Bass, Violin, and Ukulele The A4 tune can be adjusted incrementally from 430-450 Hz Four Optional Flat Tunings: b, bb, bbb, and bbbb Color LCD display B0 ~ B7 Tuning Range Requires CR2032 Battery (Included)