The Eppendorf 5403 refrigerated benchtop centrifuge has a top speed of 15,000 rpm and 23,100 x g force. A timer allows users to program runs from 1 to 99 minutes adjustable in one minute increments, with a continuous setting for longer runs. The Eppendorf 5403 has a brushless rotor designed to provide maintenance free operation. A rotor identification system automatically identifies the rotor in the machine and displays max achievable rpm and senses an unbalance in the rotor load.