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▶Place binaural earpiece in the ear, holding stethoscope head to parts need detecting.
▶According to the different needs, choose the stethoscope head you need, tap the diaphragm, sound can be heard. This will determine the stethoscope in the READY state.
▶lf the sound vibration can not be heard, turn180 degrees of stethoscope head. ''Click'' sound is heard means the right position, then pat diaphragm toward the opposite side,now vibration sound should be heard, that shows stethoscope has been set to be used.

Summary:
▶ Stethoscope is used for detecting variety of sound inside body organs like heart, lung, etc.
▶ Flat type stethoscope sound head is often used for detecting high tone noise.
▶ Bell type stethoscope head is often used for detecting low tone noise.

▶ Double use type stethoscope has coupling part of flat-type auscultation head and bell type auscultation head. Flat type auscultation head is used for detecting low frequency heart sound, extension sound, third heart sound, also first heart sound and second heart sound. High tone hum note (noise) emits from heart can also be detected. Bell type auscultation head can hear low, medium tone of heart sound and hum