Thirty-seven conductor tester for DT12 audio cables. Unlike standard three conductor audio cable that can be simply tested with a multimeter, the MT37 greatly speeds DT12 cable testing by automatically measuring for opens on each conductor and all possible shorts from each conductor to all 36 other conductors. The backlit LCD will display the location if any faults occur, and an audible alert beeps the number of faults that have been found. The MT37 is constructed from an all-metal chassis and powered by a single 9 volt battery.