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Phone/LAN Line TesterTests standard telephone jacks and LAN jacks for connection to telephone system Checks LAN lines (RJ-45) wired to 568 A/B standard for damaging telephone line current Has RJ-11 and RJ-45 style plugs Four tri-color (red/green/amber) LEDs indicate current, polarity and ringing/AC voltage on each line Tests single line, 2 line, 3 line, 4 line jacks to USOC (telephone) standard