Protect your expensive LAN Tester -- checks LAN Lines (RJ-45) wired to 568 A/B standard for damaging telephone line current. Has both RJ-11 & RJ-45 style plugs. 4 Tri-color LEDs indicate Current, Polarity, & Ringing/AC Voltage on each line. Tests Single Line, 2, 3, or 4 Line jacks to USOC (telephone) standard & LAN jack (RJ-45) wired to 568A/B standard for telephone line current. RJ-45 test plug is selectable via front panel switch for USOC (telephone) or 568 (LAN) connection. 1 year limited warranty. 

• Tests standard telephone jacks and LAN jacks for  connection to telephone system
• Protect your Expensive LAN Tester!!! - checks LAN Lines (RJ-45) wired to 568 A/B checks LAN Lines (RJ-45) wired to 568 A/B
• Has both RJ-11 and RJ-45 style plugs
• 4 Tri-color (Red / Green / Amber) LEDs indicate Current, Polarity, & Ringing / AC Voltage on each line
• Tests Single Line, 2 Line, 3 Line, or 4 Line jacks to USOC (telephone) standard
• Tests LAN jack (RJ-45) wired to 568A/B standard for telephone line current
• RJ-45 test plug is selectable via front panel switch for USOC (telephone) or 568 (LAN) connection
• Use to test a LAN jack for telephone current, which might damage an expensive LAN tester
• Compact design - fits in shirt pocket
• Economical and Convenient
• One Year Limited Warranty