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The 3M Littmann Cardiology S.T.C. stethoscope is a precision piece incorporating innovative design technology. Outstanding acoustics combined with a unique and easy-to-grasp chestpiece allow easy movement between auscultation sites. It's revolutionary design allows easy movement and handling by the health care provider while still providing outstanding acoustics. The tunable diaphragm allows the user to conveniently alternate between low- and high-frequency sounds by applying pressure on the chestpiece. 27". Also available in 22" model in black, see options.