3M Littmann Classic III Monitoring Stethoscope, Black Tube, 27 inch, 5620: Amazon.com: Industrial & Scientific
Amazon.com: 3M™ Littmann® Cardiology IV™ Diagnostic Stethoscope, High Polish Smoke-Finish Chestpiece, Black Tube, Black Stem and Black Headset, 27 inch, 6232 : Industrial y Científico