The Hermle Z207-A-CMB includes a convenient combination rotor that holds 4 x 15 ml and 4 x 50 ml tubes in the same rotor With the combination rotor theres no longer a need switch rotors or use adapters to centrifuge 15 ml and 50 ml tubes for tissue culture You can even process them simultaneously Along with the unique combination rotor the Z207-A-CMB features the unique EZ-Scrolltouch pad which gives you ease of control and a modern feel An advanced microprocessor control allow for setting/displaying of the rotational speed in either rpm or rcf in increments of 10 In addition to retrieving saved programs the easy to use front panel can be used to adjust accel/decel rates run time and change the end of run alarm tone There is also a momentary spin function that will run while the button is pressed Additionally the Herme Z207-A-CMB features a sleep mode to save energy by shutting off after a certain time if not being used while on which can be toggled on or off easily