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This instrument is designed to identify and trace wires or cables without damaging the insulation You can also use it in checking for short circuit and locating open circuit and so on. In addition, it can also be used to identify some states of telephone Designed for use with telephone lines, alarm cables, computer cables, intercom lines, speaker wires, and thermostat wiring scanning function - find out working wire (network cables, phone lines, coaxial cable, buried cable and even cable behind wall) cable tester function - check the working state of each wire. Circuit state test function - test if the circuit is working properly, or if there is a open/short circuit Cable crimper: material: metal and plastic hard and durable enough to crimp the network cables for using magnetic steel the mouth of the press-pliers is made of steel it won't damage the shelled-wire when crimping Cable tester: test correspondingly double-twisted cables 1, 2, 3, 4, 5, 6, 7, 8 and ground capable to judge wrong connection, short circuit and open circuit cable tester for rj11, rj45 etc it can easily clarify cable, continuity, open and short auto scanning function for rapid testing grounding test build in power switch for power saving operate with one 9v battery (Not Included)