DuraShock DS65 Trigger In busy medical environments where equipment needs to be rugged and robust, Welch Allyn aneroid sphygmomanometers incorporating shock-resistant DuraShock® technology keep blood pressure gauges safely accurate and calibrated longer compared with traditional aneroid sphygmomanometers. •Shock resistant for accuracy and lower cost over time •10 years calibration warranty •Laser-engraved dial for accuracy •Larger inflation bulb and high-quality air-release valve make inflation easy. 3 YEARS WARRANTY