A Rotary Shaker is a laboratory instrument designed to gently and consistently agitate samples by providing a circular or orbital motion to containers such as flasks, test tubes, bottles, or beakers. It is an essential tool in biological, chemical, and pharmaceutical laboratories, where mixing of liquid cultures, reagents, or chemical solutions is required under controlled, uniform shaking conditions.

Rotary shakers are most commonly used in microbiology, molecular biology, biochemistry, environmental science, and fermentation studies. They facilitate the homogeneous mixing of liquids, aeration of cultures, and incubation of microbial or cell cultures by providing continuous and smooth motion over extended periods.

They are often installed in ambient conditions, or placed inside incubators or cold rooms when temperature-controlled shaking is needed. Modern rotary shakers come with adjustable speed settings, timer controls, and platforms designed to accommodate different types and sizes of vessels.