This tuner is ideal for amateurs, students, professionals and teachers. It is suitable for both Acoustic and Electric Guitars, Bass Guitars, Violins and for Chromatic use. The large LCD display screen enables you to tune your instrument using the bright back lit screen display . This tuner can tune with any background / environment noise using the input / output jacks, or simply use the built in mic tuning mode. The colour LCD screen displays RED for sharp & Flat& Green for in tune (middle) also displaying the acquired frequency & tone.