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This mini pedal tuner can help to keep your instrument in tune， easy tuning on stage. Features: Keep your instrument in tune every time. Easy tuning on stage， helping to make your play more melodious. Advanced technology and delicate design. Clear view with a FND screen. Designed for stringed instruments， such as for guitar， bass， violin and ukelele， meeting your different needs. Specifications: Tuning Range: A0(27.5Hz)-C8(4186Hz) Accuracy: ±1 cent Calibration: 436-445Hz(1 Hz step) Flat: b， bb， bbb Power Supply: 9V (6F22， DC adapter)(Not included) Item Size: Approx.10.5 * 5.8 * 3cm / 4.1 * 2.3 * 1.2oz Item Weight: Approx.215g / 7.6oz Package Size: Approx.11.5 * 8 * 5.3cm / 4.5 * 3.1 * 2.1oz Package Weight: Approx.252g / 8.9oz Note: The battery and DC adapter are not included. Package List: 1 * Pedal Tuner 1 * User Manual(English)