The JT-12B tuner is a convenient and affordable tuning solution for many instruments: Guitar, Bass, Violin, Cello and numerous others (all strings). Works great in any condition, day or night, and with the reliable battery (included CR2032), the JT won"t let you down when you need it most. Stage use is made easy with the 360-degree swivel function.Incredibly accuracy and fast locking on to the pitch (quick tuning) across 8 full octaves. The JT-12B works like a charm, keeping you in key and if you want it to, informing you of the note your hitting while you play (since there is no need to plug it in, you can keep it on while playing, or switch off to save battery). The view is bright and large, with sharps indicated with a bright # symbol so you"ll never again go up a half-tone without knowing.The Clip on Tuner is the perfect gift. A low-cost tuning solution from Joyo Audio means you aspiring musician will always play it "right on" pitch!