Network cable tester for RJ45 and RJ11 cables. This type of device is used to check for faults in network and telephone cables, such as open circuits, short circuits, or incorrect wiring.
It has a master unit and a detachable remote unit, which allows for testing cables that are already installed over a long distance.
It typically operates on a 9V battery.
The device has LED indicators that show the status of each wire in the cable.
It is designed for testing the continuity of RJ45, RJ12, and RJ11 connectorized cables.