Littman cardiology III stethoscope. This outstanding, versatile stethoscope features two patented tunable diaphragms (adult and pediatric) for listening to both low and high frequency sounds. Designed for acoustical excellence, the "two-tubes-in-one design" eliminates noise artifact that can be created by the tubes rubbing together. The pediatric side of the chest piece easily converts to a traditional bell by simply replacing the diaphragm with the nonchill bell sleeve included wit