A voltage tester is a tool used to check if electrical circuits or components are live or carrying electrical current. It typically consists of two probes that are connected to a display or indicator, showing whether voltage is present. Voltage testers come in various types, including non-contact models, which detect voltage without touching the wires, and contact models, which require the probes to be placed on the circuit. These tools are commonly used in electrical work to ensure safety before working on wiring or electrical systems, helping to prevent accidents and electrical shock.

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