Littmann Cardiology IV StethoscopeGet improved acoustics and updated design features from the Littmann Cardiology IV Stethoscope. Adjust your level of pressure on the adult or pediatric side of this one piece diaphragm to hear the faintest high frequency sounds. Dual head, Aluminum headset, Machined stainless steel bell. Single piece tunable diaphragm on both sides. Adult side of the diaphragm measures 1. 7" Pediatric side of the diaphragm measures 1. 3" Hear low frequency sounds with