Korg BA-40 - tuner with 6 different tunings for bluegrass instruments (banjo, fiddle, mandolin, resonator guitar, guitar and bass). Tuning via built-in 1/4" jack input or built-in microphone, LED display, includes reference tone generator and fold-out stand. Wide range (E0 (20.60Hz) up to C8 (4186Hz). Accurate to ±1cent.