Tunable diaphragm and rim assemblies are available for 3M™ Littmann® Master Cardiology™, Cardiology S.T.C., Cardiology III, Cardiology II S.E., Master Classic II, Classic II S.E., Select and Lightweight II S.E. stethoscopes.

These assemblies allow for easy replacement of the tunable diaphragm and rim on appropriate Littmann stethoscopes. The tunable diaphragm allows the user to conveniently alternate between the low- and high-frequency sounds without turning over the chestpiece.