Cherub WST-523 Clip-on Auto Tuner Designed for Guitar, Bass, Wind Instruments, Violin, and Ukulele. Two tuning modes: MIC and Clip. Large LCD has three colors to tell you the status of your note: sharp, flat, or in tune. Tuning range: A0 (27.5Hz) - A6(1760Hz) Calibration: A4 Range:430Hz - 450Hz