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  • Testers designed to measure the electrical impedance between the surface of external electrocardiography electrodes and the skin; most testers are also capable of measuring interference voltages that may be stored on electrodes (i.e., offset voltage) and/or detecting faulty lead wires or cables. Electrocardiographic impedance testers are used mainly to assess the ability of a set of surface (skin) electrodes to conduct bioelectric signals from the skin to the electrodes; they can also measure the impedance of the leads and cables from the electrodes to the measuring unit.
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