Wire tracer XT25 is an easy to use tool e.g. for telecom technicians for their daily installation and trouble shooting work. With XT25 one can trace and find wire pairs for example in cross connections and distributing terminals as well as trace cables on cable shelves etc. Transmitter XTT25 also includes an interference-free high impedance listening (tapping) of pairs and a data indicator and informative DC voltage and polarity indication.