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Amazon.com: Customer reviews: 3M Littmann Stethoscope, Master Cardiology, Navy Blue Tube, Stainless Steel Chestpiece, 27 inch, 2164
![3M Littmann Stethoscopes on X: "To register your 3M™ Littmann® Stethoscope, you'll need your serial number, which is found on your chestpiece. http://t.co/ElEnz3HmSl" / X 3M Littmann Stethoscopes on X: "To register your 3M™ Littmann® Stethoscope, you'll need your serial number, which is found on your chestpiece. http://t.co/ElEnz3HmSl" / X](https://pbs.twimg.com/media/B-I3kK9IgAAfLXJ.jpg)
3M Littmann Stethoscopes on X: "To register your 3M™ Littmann® Stethoscope, you'll need your serial number, which is found on your chestpiece. http://t.co/ElEnz3HmSl" / X
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