Centrifugal machines can range from very basic to those with a lot of additional time and energy saving features. One really important consideration is the design of the mouth of the centrifuge that will allow for easy cleaning of those spills that are bound to happen. Metal or durable plastic construction also allows easy external cleaning and disinfecting. Variable speed controls, preset functions and timers, metal rotors and bowls, and options for handling different sizes of tubes are additional centrifuge features to consider. Since each lab will have different requirements, knowing that you are going to use the centrifugal machine for and buying one with the desired options is always the best option.