LW Scientific USA U8AD Combination Centrifuge NSN N. They even have an auto-brake to stop the rotor in less than 30 seconds to save time in busy labs. Specifications for LW Scientific E8 Centrifuge 3500RPM: Manufacturer: LW Scientific Color: Black Condition: New Features of LW Scientific E8 3500RPM Centrifuges: Accurate speeds for specific g-forces Proper separations without cell damage Quiet vibration-free operation Auto-brake stops the rotor in less than 30 seconds Angled rotor 8-tube capacity Holds 3ml to 15ml size tubes 12 volt DC maintenance-free motor Clear view port in lid for using tachometer Suction-cupped feet prevent slipping Lid safety shut-off switch Maximum RCF=1534g Eight-place rotor Eight 15ml tube sleeves Eight 13x75mm tube sleeve inserts Package Contents: LW Scientific E8 3500RPM Centrifuges 110/220v auto-switching power adapter (CE UL cUL approved) LW Scientific E8C-U8AT-CRT3: USA U8AD Combination Centrifuge NSN