Compact and convenient. The BOSS TU-01 Chromatic Tuner is a must-have accessory for keeping your instrument pitch-perfect. It’s a robust, reliable design which offers tuning modes for both electric and acoustic guitars, basses, as well as ukuleles. And, it offers a must-have chromatic tuning mode for a refined tuning experience. You’ll also find it easy to read the vivid display in any setting, so it’s perfect for darker venues too. You can even adjust the tuner for different viewing angles to ensure you can tune to perfection. Don’t risk an off-key performance, get it right with Boss.