Medical Double-Tube Multi-Function Stethoscope, Double-Sided Fetal Heart Rate Stethoscope, Heartbeat Special for Pregnant Women, Adults and Kidsren, Universal

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【Main Materials】Steel, plastic tube, spring piece.

【Technical Parameters】
Frequency response curve: 100-500Hz based on the test sound source. Attenuation not greater than 12dB, and not greater than 20dB at 500-1000Hz.
Spring piece hardness: HR15N82.9-88.4.
Ear hook elasticity: When the two earplugs are pulled apart 140mm, the elasticity value is between 1.372-1.960N.
Ear hook resilience: When the two earplugs are pulled apart 300mm, they return after 1 minute, with deformation not greater than 10mm.
Large flat diaphragm diameter: 45mm.    Small flat diaphragm diameter: 30mm.
Large bell diaphragm diameter: 34mm     Medium bell diaphragm diameter: 25mm
Small bell diaphragm diameter: 20mm     Tube length: 58cm
(1) The diaphragm is made of high-quality polyester material, wear-resistant.
(2) The stethoscope head is made of high-quality zinc alloy material, with excellent workmanship, flexible rotating axis, and smooth switching of the auscultation surface by rotating 180 degrees. The ear hook is adjustable and can be adjusted by the user. The ear hooks are balanced left and right.
(3) The rubber tube is flexible and not prone to aging.
(4) The earplugs are made of PVC synthetic material, comfortable to wear. There are 3 different sizes of earplugs available.
(5) The multifunctional stethoscope, in addition to the original large and small auscultation surfaces, also includes adult bell-shaped auscultation surface, medium bell-shaped auscultation surface, children's bell-shaped auscultation surface, earplugs, and large and small diaphragm accessories in the accessory package, assisting in flexible use in various situations.