How to make a real Stethoscope using waste headphone(it's really works) - YouTube
Time to go tubeless! – Stemoscope
Mechanical Failure Stethoscope Em410, Car Electronic Audio Stethoscope, Motor And Engine Abnormal Sound Detection With Headphone - Tool Parts - AliExpress
Stethoscope made out of clay. | In ear headphones, Stethoscope, Making out