PCE-180 CBN Wire Tracer Portable handheld cable locator, fault meter or electrical circuit tester with built-in headphone jack. PCE-180 CBN is a handheld, portable, battery-powered wire tracer or cable locator that consists of an amplifier probe and acoustic signal or tone generator. This locating device is designed to detect wires or cables hidden behind walls or insulation, including network and coaxial cables.