•Measure network cable length and determine the distance of open and short circuit.  

•Check wiring error in 5E, 6E, coaxial cable, such as open circuit,short circuit, jumper wire, reverse connection .  

•Portable unit with long battery life (wait-case 50 hours).  

•Automatically time-delay shut off.   

•Self-checking and automatically compensate any change in battery capacity or ambient temperature.