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3M Littmann Model 3100 offers improved sound quality and ease-of-use to help you make a clear diagnosis, every time. Exceptional sound quality reduces background noise an average of 85% with proprietary Ambient Noise Reduction Technology AND amplifies sounds up to 24 times to hear faint sounds you might otherwise miss. Easy to use for quick auscultation every time; designed to ensure comfort and durability for everyday use, weighing about the same as a cardiology-grade acoustic stethoscope. Comes with two sizes of 3M Littmann Snap Tight Soft-Sealing Eartips for a custom fit and non-chill diaphragm for patient comfort.