CENTRIFUGE TUBES ARE USED TO PERFORM A SETTLING TESTS ON WET METHOD INSPECTION MEDIA (VISIBLE OR FLUORESCENT). 100ML OF A WELL AGITATED (THOROUGHLY MIXED) BATH IS POURED INTO THE CENTRIFUGE TUBE.THE BATH IS ALLOWED TO SETTLE (AS PER SPECIFICATION) FOR A SET AMOUNT OF TIME, AT WHICH TIME THE VOLUME OF IRON PARTICLES CAN BE MEASURED, USING THE ETCHED GRADUATION AT THE BOTTOM OF THE TUBE.