Contec SC21 Digital Dual Head Stethoskop Ton Herz Lungenarterien Stethoskope

(SC21 Dual Head Stethoscope. It is composed of auscultation head, hose and earring. 4) Tap the diaphragm to hear the effect of sound. 100 Hz ~ 500 Hz as the reference of the testing sound source 500 Hz ~ 1000 Hz as the reference of the testing sound source.

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