Featuring a two-sided chestpiece, this classic stethoscope offers high acoustic sensitivity for superior performance. A tunable diaphragm on one side augments the traditional bell function of the opposite side. The Littmann Classic II S.E. stethoscope offers a traditional bell combined with a tunable diaphragm that allows the user to conveniently alternate between low- and high-frequency sounds without turning over the chest piece. 28 inch (71,1cm), Classic II S.E. Stethoscope, Black tube.