Auto-Chromatic clip-on Tuner with built-in Thermo & Hygrometers For guitar, bass, violin, ukulele C & D, and chromatic tuning - Compact and lightweight design - Accurate and easy to use - Tuning range: B0 (30.9Hz) to B7 (3951Hz) - Precision: ± 1 cent - A4 pitch calibration: 430Hz - 450Hz - Useful digital hygro and thermometers to keep your instrument safe, i.e: Average humidity for woods lies between 45 and 55% - T¡ range: -25 to 70¡C - Humidity range: 20 to 99% - Rotating clip for easy view and operation: Securely attaches to all guitar headstock or other flat instrument surfaces - Clear LCD display with 2-colour backlight - Built-in vibration piezo sensor - Auto power shut-off when not in use - 3Vdc button-cell battery (CR2032) included