... (2) Backing materials: non-woven, PE foam, and so on 1) Shapes: round, oval, teardrop and so on(2) Backing materials ... and other which is related to electrocardio test. Product features: 1, Anti-mouldness,can be stored for a long time. 2 ... , Baseline wander and distortion of ECG can be avoided. Technical index: 1, Alternating current impedance:≤3KΩ 2, Direct offset voltage:≤100mV 3 ...