TL;DR
A time domain reflectometer (TDR) is a handy tool for diagnosing faults in wiring harnesses, but they can be prohibitively expensive for many DIY mechanics. László Szőke has developed an innovative, low-cost alternative using a C-Media USB audio device to send out sine waves instead of the traditional short electric pulses. This method allows users to measure the length of the wire and detect breaks by analyzing the phase shift of the reflections.