A full-featured guitar tuner with a built in microphone so your laptop or mobile device can detect the frequency of each string on your guitar as you play each note. The following tunings are supported: Standard, DADGAD, Drop D, Double Drop D, Drop C, Drop B, Drop A, Open D, Open Dm, Open G, Open A, Open C, Open E, Eb Standard, D Standard, DGCGCD, CGCFCE, BADGBE, New Standard Tuning and C6. The online tuner also supports bass, ukulele, banjo, mandolin, violin and viola.