Tester for network cables with RJ11, RJ12, and RJ45 connectors. The device can detect if the cable is broken, if any wires are short-circuited, or determine the cable type (shielded-unshielded, straight-crossed). It can also test cables that are already installed in walls by simply connecting the detachable part of the tester at the other end of the cable. LEDs on the base and additional module indicate line breaks, short circuits, and crossings. It is suitable for testing shielded and unshielded wiring. Model type NS-468.