ST230C Tel Line Tester is a new kind of line fault tester with safety & multi-functions capabilities. Besides the basic functions as a common Tel Line Tester, it has functions of high voltage protection, and so on. ST230C Line tester is developed based on the common line tester. But it has got some more additional functions of faults testing, high voltage warning and etc. It is took the ergonomics design with the appearance style like dumbbell. It can be put on the shoulder, the lineman can do other work using hands at the same time; besides, it can be hung in the tool belt of waist through the pothook.