Korg CA-30 Chromatic Guitar Tuner An affordable compact chromatic tuner with high-tech features, ideal for brass band or orchestra instruments. High-precision LCD needle-type meter. Wide range of pitch detection covers C1 - C8. Calibration function lets you specify concert pitch. Built-in high-sensitivity mic. Produces reference tone on internal speaker. Auto power off. Low draw gets up to 100 hours of battery life in continuous use. Features: High-precision LCD needle-type meter Wide range of pitch detection covers C1 - C8 Calibration function lets you specify concert pitch Built-in high-sensitivity mic Reference tone Auto power off Low battery draw