The Beckman Accuspin tabletop centrifuge, with covered 4 bucket rotor. The buckets swings out as rotor speed increases Features of the Beckman Accuspin include: Digital controlled rpm, accurate to +/- 10 rpm, Maximum speed is 4,500 rpm, High/low power brake, Power on / off Start/reset button, Digital timer (for minutes at prescribed rpm), Digital display of rpm's, Digital display of time in cycle remainingn.