Multi-function, small and portable wire rope measuring instrument, small in size, convenient and perfect to carry with you The Finder cable tester tester can help you quickly find the required line pairs among many. Compatible with RJ45 network cable terminal, RJ11 telephone line terminal, which can test other metal wiresvia an adapter Cable check Tester measuring cable, detecting cable level, positive and negative polarity, we test a positive and negative polarity by the transmitter Tracker Wire, surge protection, data maintenance, stable performance. For engineering telephone networks, computer networks or other networks using metal wire Tester tests network cable condition, such as open circuit, short circuit, open circuit, cable type for improvement, wrong connection and opposite connection