Directly search for cables such as USB, coaxial, 5E, and 6E wires. By using the flashing port light on the hub or switch, you can locate the network port. Examine the coaxial cables in 5E and 6E for wiring errors such as jumper wires, open circuits, short circuits, and reverse connections. Find the connection or wiring issue. Find the breakage point and measure the cable's length up to 1000 meters. function of the polarity test DC voltage (0.5–60 V) measurement, memory, and calibration data storage. Time-delay shut-off and low battery alert work automatically.