I must have a stethoscope by day one of my Nursing 1300 (first) course. I have a short list of must-have equipment. Sthethoscope a vary greatly. My MIL (a retired nurse) recommends "One with double tubes that are then contained in one tube with a single chest piece that picks up high and low sounds based on pressure." She said Litman is good, but then said $300 range.Wow! I intend to keep this for years, but I need a good value for my money. Advice on make/model and when to or not to skimp on price is greatly appreciated.