Marshall MT-1 Guitar/ Bass Tuner Supports 7-string, baritone and 6-string guitars plus 4-, 5- and 6-string basses Precision LCD needle meter with easy to see sharp/flat (red) and in-tune (green) LEDs above the LCD display Tunes down to five (5) semitones flat / Built-in mic for tuning acoustic instruments Generates reference tones for tuning by ear Tilt-back slot allows you to tilt the tuner using a card