3M Littmann  Cardiology III Stethoscope, Ceil Blue, 3146 The only dual-sided chestpiece in the Cardiology line provides versatile auscultation for both adult and pediatric patients Two tunable diaphragms respond with a simple pressure change to capture low and high-frequency sounds Expand versatility by converting pediatric side to open bell for low frequencies, using the nonchill bell sleeve (included) Two-in-one tube design (dual lumen) eliminates noise interference from two external tubes rubbing together Anatomically designed headset is angled to meet the path of the ear canal