medical double-tube multifunctional stethoscope double-sided fetal heart stethoscope listen to the heartbeat special for pregnant women adult and children universal

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[main materials] steel, plastic pipe, leaf spring.

[technical parameters]]
frequency response curve: 100-500hz based on the test sound source. the attenuation is not greater than 12db and not greater than 20db at 500-1000hz.
leaf spring hardness: hr15n82.9-88.4.
earring elasticity: the two earplugs are pulled apart by 140mm, and the elasticity value is 1.372-1.960n.
earring elasticity: the two earplugs are pulled apart by 300mm, reply after 1 minute, and the deformation is no more than 10mm.
large flat listening head diameter: 45mm. small flat listening head diameter: 30mm.
large bell-shaped listening head diameter: 34mm medium bell-shaped listening head diameter: 25mm
small bell-shaped listening head diameter: 20mm catheter length: 58cm
(1) the diaphragm is made of high quality polyester material, which is resistant to abrasion.
(2) the auscultation head is made of high-quality zinc alloy, with excellent workmanship and flexible rotation axis. the auscultation surface can be smoothly switched by rotating 180 degrees. adjustable design of earrings, which can be adjusted by yourself. earrings are balanced left and right.
(3) the hose is soft and not easy to age.
(4) the earplugs are made of pvc synthetic material, which is comfortable to wear. there are 3 different sizes of earplugs.
(5) in addition to the original large and small auscultation surface, the multifunctional stethoscope also has adult bell auscultation surface, medium bell auscultation surface, children bell auscultation surface, earplugs, in accessory bag, large and small diaphragm accessories help to achieve flexible use under various circumstances.