3M Littmann Master Classic II Stethoscope The excellent acoustic sensitivity of a tunable diaphragm is the hallmark of this superior single-sided stethoscope. Award-winning design combines high performance with portable convenience. The Littmann Master Classic II stethoscope features a tunable diaphragm, which allows the user to conveniently alternate between low- and high-frequency sounds without turning over the chestpiece. Benefits of 3M Littmann Master Classic II Stethoscope: A tunable diaphragm conveniently alternates between the low- and high-frequency sounds without turning over the chestpiece. Portable convenience of single-sided chestpiece. High-performance single-lumen tubing for excellent acoustic performance in a range of attractive colors. Award-winning, ergonomic design. 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. Three-year warranty.