Korg KDM2 Digital Metronome - (New)
Among metronomes that offer frills (i. e. different time signatures and rhythms), this is the second best (the best being the Boss DB-90 which I have also reviewed).  For the most part, metronomes that offer these frills are not an improvement over a good basic metronome.  The problem is that the accented divisions of the beat sound unaccented while the unaccented divisions of the beat sound accented.  The Korg KDM-2 avoids this problem.  It distinguishes between accented and unaccented sounds in the way on