The MDF Desk Mercury Sphygmomanometer, the most accurate sphygmomanometer available on the market, combines the performance of a traditional mercurial instrument with mobility, durability, and portability. Equipped with safety features and encased in a simple, sleek aluminum case, the mercurial manometer is protected from external elements. Mercury Scale: Easy-to-read 300mmHg scale with a glass mercury column is recessed for added protection and minimization of the parallax effect. An internal locking device in the mercury reservoir prevents mercury spillage during transport, storage, or maintenance. Cuff & Inflation Bag: Abrasion, chemical (chlorine and peroxide), and moisture resistant, the adult Velcro cuff is constructed of high-molecular polymer nylon. Sized to meet American Heart Association recommendations, the artery indicator label and index range further ensure proper cuffing for correct arterial compression. The double tube seamless inflation bag is constructed of crack-resistant, non-sticking, high-density hypoallergenic latex-free PVC. The universal bladder tube enables compatible cuff exchange with all MDF and other branded blood pressure systems. Inflation Bulb & Valve: Chrome-plated brass screw-type valve delivers precise deflation control rate. The inflation bulb is constructed of crack-resistant, non-sticking, high-density hypoallergenic latex-free PVC. Included Accessory: ID tag. Warranty and service: Lifetime calibration; 3 year warranty on case, gauge, cuff, bulb, and bladder.