The Benchmark Scientific Z366KE Hermle Universal Mid-Range-Capacity Refrigerated Centrifuge (No Rotor), 230V offers a unique "Mid-Range" swing out rotor that accepts a variety of different tubes, including up to 12 x 50ml or 28 x 15ml. Despite this step up in capacity, the Z366-K-E maintains a surprisingly compact design, with the standard air-cooled model featuring a footprint of 17 x 20 inches. In addition to the popular 4 x 250ml swing out rotor, a variey of additional rotors are also available. Angled rotors range from a 24 x 1.5ml micro rotor to a high capacity 6 x 250ml rotor. A 6 x 3 position microplate rotor is also available, as well as a 4 x PCR strips (8-strips). Advanced microprocessor controls allow for instant rotor identification, which automatically converts the rotational speed to the relevant g-force (rcf), preventing the user from setting a speed above the capabilities of the installed rotor. In addition to retrieving saved programs, the easy to use front panel can adjust accel/decel rates, and change the end of run alarm tone.