Molex 33-100 0180390001 SLT3 Single Line 3-IN-1 Voice/Data Cable Tester CABLING TESTER - The SLT3 tester is used to verify or indicate wiring errors on 2, 4 and 4 pair voice and data channels, The continually sequencing LED display provides instant notification of any shorts, opens, reversals or miswires Allows Verification of twisted pair cabling Includes test patch cords