Designed to apply increasing centrifugal force or the displacement of liquid from water-saturated rock core samples. Centrifugal force is used to develop pressure differences at the interface of two immiscible fluids – air and water or oil and water. Maximum speed is set by rotor selection for example the PIR20 for one (1) inch samples has a maximum speed of 20,000 RPM whilst the 1.5 inch PIR16.5 rotor’s maximum speed limit is 16,500 RPM. The complete system can perform drainage capillary pressure tests on 1″ or 1-1/2″ diameter samples with appropriate rotors installed. This updated system includes full automation and data calculation. The produced liquid interface position in the fluid measurement holder is determined and recorded using a computer controlled CCD line camera and strobe unit. Minimum resolution of the liquid interface position is 0.002 inches. The maximum data rate is 10/second or 1 revolution below 600 RPM.