The super-duty MDF Desk & Wall Aneroid Sphygmomanometer system features calibrated manometer for clinical grade, certified accuracy. The safety, durability and convenience features of the MDF840 make it ideal for high traffic areas in the emergency room, clinic or ambulance. Gauge: To reduce the parallax effect and achieve accurate viewing at all angles, the large Scale is imprinted with black-bold dials and pressed with a raised outer rim. The internal manometer is enclosed in a die-cast zinc housing that is cushioned within the external high-impact thermoplastic case to double the protection against shock. 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 to attain correct arterial compression. The coiled tubing and seamless Inflation Bag is constructed of crack & stick-resistant, high-density hypoallergenic latex-free PVC. The universal Bladder Tube enables compatible cuff exchange with all MDF and other branded BP systems. Inflation Bulb & Valve: Deluxe chrome-plated brass screw-type Valve with filter facilitates precise air release rate. The extra-large Inflation Bulb is constructed of crack, stick-resistant, high-density hypoallergenic latex-free PVC.