Chase microhematocrit capillary tubes are manufactured to specifications which make them universally acceptable within the healthcare community. Their uniform inside diameter makes readings accurate and consistent. Their standard color coding makes them easy to identify and use for specific applications. Chase ESR (Erythrocyte Sedimentation Rate) tubes are manufactured from precision glass tubing in order to comply with the standards of normal values. The tubes are precision calibrated for accurate results of red cell sedimentation. The 6-place or 12-place Universal Sed-Rate Racks hold the sed-rate tubes firmly in place. The racks are manufactured with a leveling bubble and leveling screws in order to assure that the tubes are exactly perpendicular which is essential to an accurate reading.