Stethoscope (A type): double

Features
Quality brass head.Clear & Pre-cise sound.
The tube adopt with quality PvC.elastic and strength.
Equiped with bell shaped head.
Specification
Response curve:100-500Hz as the reference of the testing sound source.Damping≤12dB，500-10O0Hz≤20dE.
Hardnessof spring sheet: HR15N82.9-88.4.
Earrings stretch: when draw the earrings to 140mm.elastic force1.372-1.96ON.
Earrings stretch: when draw the earrings to 300mm, recovered inlmin，deformation less than 10mm.