Liberty Tunable Head Stethoscope. Dual head professional stethoscope with superior acoustic sensitivity and pressure sensitive diaphragm. The high performance stainless steel chest piece is at the top of its class. Tunable diaphragm. Advanced two-layered design ear tips resulting in super soft tips for superior comfort. 5 Year Warranty! Free removable name tag, ear tips and diaphragm supplied. Great value, best seller!