27 inch (69cm) Master Cardiology™ Stethoscope 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 eliminates tube noise artifact from two tubes rubbing together. Portable convenience of a single-sided chestpiece. 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. Available in a selection of classic tube colors. Seven-year warranty