Monoprice Multi-Function F-Type, RJ-12 and RJ-45 Cable Tester (108129) Cable Testing Cannot Get Any Easier Than With The Monoprice Ezchecker 008 Cable Tester This Tester Is A Quick And Easy Continuity Checker For RJ45 , RJ11/12, And F-Type And BNC Coax Cables It Tests Each Conductor On RJ Cables And Instantly Provides A Pass Or Fail Result, With An Indication Of Which Conductor Is Faulty In The Event Of A Failure The Tester Consists Of Two Pieces: The Master Unit And The Remote Terminator, Which Can Be Detached From The Master Unit By Sliding It Off To The Right There is no on/off switch or test button, simply connect the wires and get your result