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Adjustable, non-contact voltage tester that indicates the presence of AC voltage from 50 ? 600V. Visual (flashing) and audible (beeping) indicators signal presence of voltage. Built-in ?safe test? feature assures batteries are operating properly. Compact design fits in pocket. Operates on 1 ?AAA? battery (included). Tests: outlets, switches, circuit breaker panels, wiring, and light fixtures.