A self powered test light, sometimes called a continuity tester, is used to test a circuit with current flowing in the circuit from the circuit's power supply.

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A self powered test light, also known as a continuity tester, does not require current flowing in the circuit to test for continuity. It is simply a tool that illuminates when a connection or continuity is present in the circuit being tested.

A Self Powered Test Light, Sometimes Called a Continuity Tester