3M Littmann Stethoscope Cardio IV Black3M Littmann Stethoscope Cardio IV Black Clear, reliable cardiac auscultation The 3M Littmann Stethoscope Cardio IV Black is a premium cardiology stethoscope designed for clinicians who need exceptional acoustic performance. Ideal for cardiology, emergency, and general practice, it helps you hear subtle heart, lung, and other body sounds with clarity. With a tunable diaphragm and dual lumen tubing, the Cardio IV delivers crisp, highfrequency sound