The definitive compact tuner! Supports guitarists/bassists with an easy-to-read LCD needle-style meter and a variety of functions! Built-in microphone also supports tuning of acoustic guitars, etc. Features a Quinta Flat Tuning Mode that can measure from a half step to five half steps down. Supports tuning for 7-string guitars and 6-string basses. https://www.korg.com/jp/products/tuners/ga_1/