A metronome holds a steady pulse so practice stays in time and tempo work becomes measurable. The Korg units here run from the pocket-sized MA-2 to the KDM-3 digital metronome, offered in black, white and a wood black finish, along with the BEATLAB mini rhythm trainer. Combination models such as the TM-70T pair a metronome with a tuner, which suits players who want one device on the stand.