Ideal for serial rotation of tubes for extraction diffusion etc. It consists of a series of U-shaped, plastic coated spring clips mounted on both sides all along the length of a rectangular bar for holding test tubes of diameter 10 to 30mm, which in turn is mounted on the rotor unit. The other end of rectangular bar is supported on pillar by means of a bearing. The rotor assembly has variable speed motor with provision for adjusting rotational speed from 5 to 50 RPM. Also incorporates a user settable timer from 0-99 hours / 1-59 minutes. The electronic touch panel having soft touch membrane type keypad along with 7 segment bright red LED display allows for convenient operation. Specially designed quick easy coupling mechanism for exchange of rotating bars. Operates on 220V AC, 50Hz.