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Labtron Cardiology Dual-Frequency Stethoscope$38.38
Stainless steel single-sided chestpiece with dual-frequency diaphragm. Specially designed membrane lock, within the chestpiece, alters the diaphragm to achieve dual-frequency. Hold the chestpiece to achieve low frequency response (similar to dual-sided bell chestpiece).
Apply firm pressure to achieve high-frequency diaphragm response.