Tests Both Shield (ftp) & Unshielded (utp) Cables Via Rj45 Port Tests Rj11 Telephone Lines & Coaxial Cable Via Special Adapters (not Included) Detects Open Circuits Short Circuits & Mismatched Wiring In Any Variety Of Cables Determines The Length Of Individual Strand In Pair & Length Mode With 97% Accuracy LCD Display Provides Clear Results While Showing How Each Wire Matches Up Locates Up To 8 Far-end Passive Ports Single-chip Microprocessor Watchdog Software Ensures Reliable Operation Measures Length & Recognizes Pairs Without The Far-end Port Low Voltage Battery Alarm & Indicator Requires 4 AA Batteries