Hand Gauge Sphygmomanometer - Double Tube with Thumbscrew ValveMaintain accurate blood pressure readings with lower lifetime cost with gear free DuraShock technology, the first major innovation in aneroid technology in nearly 100 years. Part of our Gold Series, the DS66 Trigger features an innovative trigger release design for easy operation. Shock resistant to maintain accuracy with lower lifetime costcan withstand up to 30" drop and remain in calibration Soft comfort grip Jewel movement for long life Laser