About D'Addario Nexxus 360 PW-CT-29 USB Rechargeable Tuner for Cello & Bass:
 
The Nexxus 360™ Rechargeable Cello & Bass Tuner offers the fastest, most accurate tuning for cello or bass. It features an extra bright, full-color LED with 360-degree adjustability for the perfect viewing angle and screen clarity in any lighting. From the classroom to the stage, enjoy up to 24 hours of tuning and an auto power-off setting to help you maximize each charge. The Nexxus 360's piezo reads vibrations and is optimized for orchestral stringed instruments, and offers our widest hertz range—from 415 to 465Hz. For best accuracy on cello and bass, attach the tuner to the side of the bridge with the lower strings.1 ft USB-C cable included