Liquid handler with dual pipetting groups

A liquid handling system, comprising:

• a first pipetting group, comprising at least one pipettor, movably arranged on a first arm, wherein each of the at least one pipettor is independently movable in a Y-axis direction, which is parallel with a longitudinal axis of the first arm, and in a Z-axis direction, which is perpendicular to the Y-axis direction;
• and
• a second pipetting group, comprising at least one pipettor, movably arranged on a second arm, wherein each of the at least one pipettor is independently movable in the Y-axis direction and in a Z-axis direction,
• wherein the first arm and the second arm are movably arranged on at least one track such that the first arm and the second arm can independently move along the at least one track in a X-axis direction, which is perpendicular to the Y-axis direction and the Z-axis direction, while keeping the first arm parallel with the second arm,
• wherein the at least one pipettor of the first pipetting group is arranged on a side of the first arm facing the second pipetting group,
• wherein the at least one pipettor of the second pipetting group is arranged on a side of the second arm facing the first pipetting group.