Microhematocrit Capillary Tube. These capillary tubes are designed for both safe blood collection as well as an accurate microhematocrit determination. Precision molded, they provide excellent sample retention during centrifugation. Tubes fill rapidly without affecting specimen integrity. Packaged in a protective snap cap vial. 100 tubes/vial. Technical Specifications: ID: 1.15mm ± 0.05mm; OD: 1.5mm ± 0.05mm; Length: 75mm ± 1mm; Volume: 75l.