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3M Littmann Cardiology IV Diagnostic Stethoscope, Standard-Finish Chestpiece, Raspberry Tube, Stainless Stem and Headset, 69 cm, 6158 Acoustics with better audibility of high-frequency sounds (adult side, firm pressure). Tunable diaphragm: Hear high or low frequency sounds by slightly adjusting pressure on the chestpiece. Dual-lumen tubing: Two sound paths in one tube eliminates... 3M Littmann Cardiology IV Diagnostic Stethoscope, Standard-Finish Chestpiece, Raspberry Tube, Stainless Stem and Headset, 69 cm, 6158