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  • Electrical resistance testers designed to measure resistance to the direct current (DC) of a circuit conductor. Some testers are simple units that detect continuity and show the results using lighted displays (e.g., LEDs). Other testers use the four-terminal technique to measure the resistance (e.g., in milliohms) and display the numeric results; they typically include a DC power supply (e.g., a battery). Line cord resistance testers may include visual or audible signals that are activated when the circuit is open and/or the resistance is under a predetermined value; they are used to determine the continuity of conductors and other low resistances such as the contact resistance in receptacles.
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