Welch Allyn DuraShock Gold Series DS66 Trigger Aneroid Sphygmomanometer with a Size 11 Adult Cuff. This innovative gauge features a smooth trigger-style air release valve and ergonomic design with soft plastic inserts at key touch points for comfort and easy operation. With gear-free DuraShock technology and jeweled movement, you can count on the robust design of the DS66 Trigger Aneroid to remain in calibration longer than traditional aneroids, providing more accurate readings, certified to +/- 3mmHg, over time. Latex-free.