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This tone generator and probe are practical tools. They apply for installing network and checking objects. The tone generator emits a single signal or multiple frequency signals and has two single test cartridges and a 4 p test joint. When wires are bounded and hidden in the wall or are imbedded by a barrier while you are using the tone generator, the tone signal which is sent by the main frame is very easy to test with the probe. The continuity of a wire, a fault of the wire, the polarity of the circuit, a network or the working voltage of the modular cable can be tested by this group tester. The pathway of the circuit and detail position can be judged by the pilot light and the tone of the speaker.Features:The amplifier probe is designed to identify and trace wires or cables within a group without damaging the insulationWorks with any tone generator to identify wiresVolume control for increased sensitivity and adjustable to suit work environmentRecessed On/Off button prevents battery drainIt can be power with only one 9V battery and the device has a long battery life (approx. 100 hours of use)A plug receptacle is provided for use with a headset or headphoneRed and black test leads are provided, and it has a standard conductor modular cord and plugA 3-position toggle switch controls the modes of operation plus a 3-colored LED is provided for the line polarity, continuity and voltage testingA tone selector switch, located inside the test set is provided for choosing either a single solid tone or dual alternating tone (CAUTION: Do'nt connect to an Active AC circuit exceeding 24V in this mode)