The present disclosure relates to a rotatable tube rack holder for a tube rack rotator device, comprising: one or more plate(s) extending radially from an axis of rotation; one or more compartment(s) for tightly holding one or more tube rack(s) configured to hold a plurality of tubes, said compartment(s) is/are attached to at least one side of said plate(s); and one locking mechanism for each of said compartment and configured such that when said tube rack(s) holding a plurality of said tubes is/are placed inside said compartment, said tubes are restricted from moving in a direction perpendicular to said plate.

A mixing device includes: a guide module which has a preset length, to which the mixing container is rotatably seated along a longitudinal direction and to which the mixing container is selectively fixed to be attachable and detachable; a rotating module which is provided on the guide module and selectively rotates the mixing container so that a first rotation axis is formed along the vertical direction of the mixing container; and a tilting module which is formed long along the vertical direction, has a second rotation axis on both sides along a width direction of the guide module, is rotatably coupled, and selectively rotates the guide module in the vertical direction to tilt the mixing container in a direction intersecting the first rotation axis.