BEHRINGER / CT100 can check cables with XLR, TRS phone, RCA and MIDI connectors. You can see at a glance which input pins are connected to which output pins, and individual LEDs indicate the correct shield connection and the presence or absence of phantom power. The CT100 also has a cable test mode, continuity check, and test tone generator.
Not only can you check for broken wires, but you can also easily check pin assignments! The housing is made of steel and is designed to be highly durable.
The dbx/CT3 is compatible with a variety of cables, including audio and video equipment as well as network equipment. By separating the left and right halves, you can test cables that are already installed.