This is a professional-grade cable tester designed for use with Ethernet Cat 5, Ethernet Cat 5e, Ethernet Cat 6, RJ11, and RJ45 cables. Whether you're a professional network technician or a DIY enthusiast, this tool will help you quickly and easily identify wiring faults and other issues with your network cables. With its intuitive design and easy-to-use interface, this cable tester is perfect for use in a wide variety of settings, from small home networks to large enterprise installations. And with its rugged construction and reliable performance, you can be sure that this tool will provide you with years of trouble-free service.