The UNI-T UT681L cable tester is an easy-to-use device for testing RJ11 and RJ45 cables, also known as telephone and Ethernet cables. The cables can be tested for open, short, and crossover circuits. The device consists of two modules, one acting as a transmitter and one as a receiver, meaning you can test a signal over an entire cable. These two modules are separable, you can connect each separate part at the end of the cable, meaning you can test a cable even when the cable is installed inside a wall.
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