Cable locater consist of transmitter and receiver with this pro881 model, The transmitter is in the long gray box and receiver is a yellow and black wand. The transmitter places a specific tracing signal onto the metallic conductor you are trying to locate. This placing of an AC signal onto a cable produces an electrical current and an electro magnetic field around the cable. If wand is close enough , this signal is received and amplified by the wand.
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