3M Littmann Master Cardiology Stethoscope 2160, 27 inch, Black Tube

Outstanding acoustics: The highest in Littmann mechanical stethoscopes. Tunable diaphragm: Hear high or low frequency sounds by slightly adjusting pressure on the chestpiece. Dual-lumen tubing: Two sound paths in one tube eliminates the rubbing noise of traditional double tubes. Headset is easily adjusted for individual fit and comfort. Angled eartubes align with ear canals.