Welch Allyn Durashock Adult Cuff Aneroid Sphygmomanometer With Case The first and only aneroid sphygmomanometer made without gears, it meets or exceeds AAMI SP9 specifications for shock resistance, and maintains its performance characteristics after a 30-inch drop onto a hard surface. Revolutionary gauge and cuff design allows for an extremely low profile and more convenient readings, handling, and storage. The only gauge that snaps directly into the cuff for fast, easy cuff changes. Reference: DS44-11