cost of a littmann stethoscope
My favorite is the 3M Littmann Master Classic II where depending on how hard you press the diaphragm on the chest it lets you hear higher of lower frequency sounds, so no change over from diaphragm to bell, very easy to use: 3M Littmann 2141 Master Classic II Stethoscope, Black, 27 inch by Littmann. $105.99($2.21/oz)