Microlitre centrifuge Heraeus® Fresco®21, 2 rotors with 24- and 36-place rotor, incl. 24 x 1.5/2.0 ml rotor with aerosol-tight ClickSeal lid and two-row 18 x 0.5 ml and 18 x 1.5/2.0 ml rotor with screw lid