Features:Wire Mapping Function: When the crystal head is ready, use wire scanning to test the continuity of the network cable.Port Flashing Identify the Docking Port: The indicator light of the connecting network cable port will flash at the same frequency, which is safer.Length Test: Support cable length test in the range of 5M-200M.Precision Circuit Board: Using high-quality components, high-precision measurement guarantee.Resistance Test : Common resistance measuring pens can be measured with one end touching one side.NCV Induction Non-Contact: High and low AC voltage non-contact induction is safer.LED Lighting: Cables can be found clearly even in a dark computer room.HD Backlit Display: High-definition digital display large screen, clear data display, easy operation.