The Crit Carrier is specifically designed to run hematocrits on a horizontal centrifuge (minimum 5000 rpm). Simply insert your hematocrit capillary tubes into the carrier, place the carriers in opposing tube sleeves for a balanced load and spin at 5000 rpm for 8 minutes for a clear separation. The Crit Carrier converts the centrifuge into a hematocrit centrifuge. Save counter space and the need to purchase an additional hematocrit centrifuge. Spin up to 8 standard 75 mm capillary tubes.