Benchmark Scientific BSC1006-B Blue Mini Centrifuge With 2 Rotors and 6 Adapters 6,600 rpm (rotations per minute) mini-centrifuge for use in portable applications and spinning down micro-sized samples Two interchangeable rotors: one fixed-angle 6 x 1.5/2.0 mL micro tube rotor and one PCR (polymerase chain reaction) strip tube rotor Six adapters for use with 0.4-0.5 mL tubes Clear lid for constant observation of samples while spinning Electronic safety cut-off when lid is opened for added safety