I used the network tester to check whether I have network cable placed correctly on a patch panel. It's quick and easy, if the other side is already installed. In addition, I checked my patch cords and so am actually a long-sought problem came on the track. The description is sufficient, if you have some basic knowledge of network technology. The unit can also test the shielding (to corresponding contact, not on the quality of the shielding), provided suitably designed patch cable. Cheap, easy, fast.