Quote:
Originally Posted by toonlight
Well you don't need to spend that much on a tester all I spent was under £20 for my simple tester, all you need it to tell you is; have you connected up your network or sockets right.... that all as the rest is plain sailing.
here : £11.49 > plug in with a ethernet patch lead. Look for the lights for any faults

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Unfortunately that's just a glorified continuity tester. It just indicates if there is a good DC connection with no shorts or mis-wiring. A cable could test ok with one of those testers and still fail to achieve the expected speed.