Peterson VS-F StroboFlip Virtual Strobe Tuner 0.1 Cent Accuracy Peterson Sweetened Tuning for guitar, bass, Dobro, steel guitar, violin, viola, cello. Battery Operated Or Included AC Power Supply 8 User-Programmable Sweetened Temperament Banks Pitch Holder Mounting Clamp, Power Supply And TP-2 Tuning Pickup Included