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8-in-1 Cable Tester for XLR, speakON, 1/4" and 1/8" TRS, RCA, RJ45, MIDI, and USB Connectors with Cable Test, Installed Cable Test, and Tone Generation Modes
  Behringer CT200 8-in-1 Cable Tester (CT-200 / CT 200)

Behringer's CT200 cable tester is an absolute must-have in your studio or live-sound toolbox.