Features: brand new and high quality This RJ45 Cable Tester can be applied in testing not only UTP and shield RJ45 cat5 cat6 cable,but also RJ11 RJ12 telephone lines. Test of double-twisted cables: Switch on the power. (S is slow automatic grade, for M is manual.) Put cables into both maintester and remotetester. The lights of the main tester will turn on sequently form 1 to G. Main tester: 1-2-3-4-5-6-7-8-GRemote tester: 1-2-3-4-5-6-7-8-G RJ45 1-2-3-4-5-6 RJ11Following are abnormal connections:If one cable, for example cable NO.3 is open circuited, the two NO.3 lights of the main tseter and remote tester will not turn on.If several cables are not connected, several lights will not turn on respectively. If less than two cables are conntected, none of thelights is on. If two ends of a cable is disordered, for example NO. 2and NO. 4, then displays on:Main tester: 1-2-3-4-5-6-7-8-GRemote tester: 1-4-3-2-5-6-7-8-GIf two cables are short circuited, neither of the corresponding lights is on of the remote tester while main tester remains unchanged. Ifthree cables, including three, are short circuited, none of the corresponding liaghts is on. If test patch panels or wall plate outlels, two cables which can match each other (RJ45) will be connected to the tester. If test cables of the same axes, BNC turns on when the cable works. Specifications: Material:ABS Color:Blue Size:100x95x25mm/3.94x3.74x0.98in Double Layer Circuit Board Note: Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Network Cable Tester 1x Manual