The Cablenet RJ45 Continuity tester is a device that transmits an electrical signal through each of the wires in a copper twisted pair cable to determine if it is connected to the correct pin at the other end. Can be used to test installed cabling or individual patch leads Can be used to test the shielding continuity on FTP cabling Compact and easy to carry Easy to verify cable continuity - Open, Short or Misswire Can test RJ45, RJ11 and RJ12