3M 6154 Littmann Cardiology-IV 27 inches Stethoscope – Navy Blue by 3M

Outstanding 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 the rubbing noise of traditional double tubes. Next-generation tubing lasts longer and resists stains. Not made with natural rubber latex or phthalate plasticizers