Amazon.com: 3M Littmann Stethoscope, Cardiology IV, Black Tube, Black Chestpiece, 27 Inch, 6163 & Classic III Monitoring Stethoscope, Black Edition Chestpiece, Black Tube, 27 Inch, 5803 : Industrial & Scientific
Amazon.com: 3M Littmann Classic III Monitoring Stethoscope with ID Tag - Caribbean Blue Tube, 27 inch : Industrial & Scientific
Amazon.com: Customer reviews: 3M Littmann Cardiology III Stethoscope, Black Plated Chestpiece and Eartubes, Black Tube, 27 inch, 3131BE