The BOSS TU-12EX is a chromatic tuner designed for both guitar and bass, built to replace the popular TU-12 model. It features BOSS's iconic needle and LED indicators, providing musicians with fast and accurate tuning. The tuner supports flat tuning options down to six half steps, making it versatile for various tuning needs. Additionally, it includes the ACCU-PITCH feature, which emits an audible beep to confirm tuning accuracy. The built-in microphone allows for convenient tuning of acoustic instruments without the need for a pickup. Its battery-saving Auto-Off feature ensures extended battery life during use, making it a reliable choice for performers on the go.