3M Littman Master Cardio Stethoscope

Outstanding acoustics: The highest in Littmann mechanical stethoscopes.
Two-in-one tube design (dual lumen) eliminates noise from two tubes rubbing together
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.