Labtron Blood Bag Tube Sealer seals blood and infusion bags using high-frequency sealing for tubes 3–6 mm in diameter with a 0.5–2 s sealing time. The single-chip system automatically adjusts sealing voltage, while uniform heating supports firm seals. A circulating air duct reduces internal temperature for continuous operation. Manufactured blood bag tube sealer for blood bag sample handling in blood banks, hospitals, and biological industries.