Features:

• High-precision LCD needle-type meter for stable tuning.
• Quinta Flat Tuning mode lets you tune 1--5 semitones flat
• Supports 7-string guitar tunings.
• Sound Out can produce a reference tone from the internal speaker.
• Auto Power Off function conserves battery life.

Rating : - GA30 Guitar/Bass Tuner
My son, who this was purchased for, has just started taking guitar lessons. He states that the tuner works very well. Four stars.