3M Health Care 2632 Stethoscope, 27" Hunter Green Tubing (US Only). The excellent acoustic sensitivity of a patented tunable diaphragm is the hallmark of the low-profile Littmann Master Classic II. Aware-winning design combines high performance with portable convenience in this single-sided stethoscope. Features patented Littmann Snap Tight soft-sealing eartips, patient friendly, nonchill rim and diaphragm. Three-year warranty, plus lifetime service and repair policy.