Also, known as "continuity tester," an electrical test device that determines the integrity of a circuit. In its simplest form, may be wires, a battery and a light (or buzzer).
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Almost every VOM will have either a setting for continuity, where it will beep or flash if a circuit is complete, or the resistance setting (Ohms, Ω can be used. If an infinite amount of resistance, the circuit is open.
See the tutorials at Multimeter Tutorial - Learning about continuity.
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