Tube, 27 inch 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. Features: 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. Specifications: Used as a diagnostic aid as part of the physical assessment of a patient.