Bioreactors allow the culture of microorganisms such as bacteria, yeasts, animal and plant cells under controlled physico-chemical conditions. The devices presented are laboratory devices allowing the culture in low volumes of medium while allowing to better control the parameters. Some can be used for continuous or fed-batch cultures. These bioreactors are easy to use. They can be used in parallel to study several parameters at the same time and thus make it possible to optimize the development of production processes.