A tunable diaphragm and superb craftsmanship offer the ultimate performance in a superior single-sided stethoscope. The Littmann Master Cardiology stethoscope meets the exacting standards of health care professionals who demand superior acoustic response.Tunable diaphragm allows the user to conveniently alternate between the low- and high-frequency sounds without turning over the chestpiece.Handcrafted solid stainless steel chestpiece.Dual-lumen design liminates tube noise artifact from two tubes rubbing together.Excellent acoustic seal and comfortable fit with patented 3M Littmann Snap Tight Soft-Sealing Eartips.Comfortably angled, anatomically correct headset.Patient-friendly, nonchill rim and diaphragm. Special procedures adaptor for difficult site or pediatric auscultation.Seven-year warranty.Latex free.