Lab rotator mixer it is used n mixing samples for applications used in clinical testing, biochemistry and molecular biology. They are used with sample tubes that are rotated, rocked and tumbled to mix samples vertically and horizontally The rotator can be adjusted to meet the needs of the application. Rotator mixers roll samples in test tubes and other containers in end-over, end motions for a consistent mix and can sometimes act as a suplimental hybridization instrument.