Welch Allyn DuraShock DS54 Thumbscrew Aneroid Sphygmomanometer The DuraShock DS54 from Welch Allyn is a sturdy aneroid sphygmomanometer designed and built to withstand the demanding AAMI shock resistance test. The sphygmomanometer features a convenient, traditional thumbscrew release valve and clear 50mm dial. Supplied with a standard adult Flexiport Cuff and soft case. Latex free. 3 YEARS WARRANTY