Microcentrifuges Microcentrifuges are an indispensable tool found in clinical, research and academic laboratories. They can be used for spinning down DNA, protein, blood or other samples. They are available in sizes varying from tiny personal microcentifuges to hefty benchtop models. Some models are refrigerated to protect the integrity of sensitive samples. Features to look for include programmable controls, rotor size and capacity, rotor speed, and quiet operation. It is also helpful if the rotor is easy to clean and maintain.