Centrifuge apparatus with measuring device on a transparent cover

A centrifuge apparatus, comprising:

• a rotor;
• cover releasably secured to the rotor for rotation with the rotor;
• a securing device releasably securing the cover to the rotor to form a centrifuge cavity between the cover and rotor for receiving capillary tubes containing material to be centrifuged;
• the cover being transparent;
• a measuring device on the cover, whereby the contents of the capillary tubes may be measured and monitored;
• the measuring device comprising a plurality of spaced concentration lines each extending around the cover in a generally spiral configuration whereby the spacing between each adjacent pair of concentration lines varies around the cover, and a plurality of different graduated scales extending radially from the center of the cover across the concentration lines at spaced angular intervals, each scale comprising a series of numerical markings associated with respective concentration lines and the scales defining a plurality of different measurement layouts;
• and
• the rotor and the cover each having a central portion and the securing device comprising opposing snap lock elements at the central portion of the rotor and cover, one of the snap lock elements comprising a central projection having an annular groove and the other snap lock element comprising an opening for fitting over the projection, the opening having an annular rib for releasable snap lock engagement in the groove.