Engineered for precision and ease of use, Jonard Tools' modular cable tester is an essential device for any technician dealing with networking cables. With the ability to test RJ45, RJ12, and RJ11 terminated cables, this tester verifies connections for opens, shorts, and miswiring efficiently. It features full LED indication lights on both the main and remote units, providing clear and immediate feedback on testing results, and offers the convenience of automatic testing initiation with the simple flip of a switch. For more detailed observations, the "S" switch allows users to slow down the testing procedure, giving ample time to assess each test closely. This device comes complete with a nylon carrying case and includes a 9V battery, making it a ready-to-use solution for on-the-go professionals. Please note that this product is RoHS compliant, ensuring it meets strict environmental standards.