1Stable Output Power: The non contact connection does not damage the end face of the optical fiber and the transmitter, so that the output power is stable and not affected by the voltage. 2Professional Equipment: This visual fault locator is specially designed for the design and maintenance of fiber optic cables and lines, used to locate defects on fiber optic cables and cables, visually find fiber optic breaks and fiber optic cable defect equipment. 3Long Output Distance: The output distance of our red light pen is 30KM, which can test the fiber faster and more directly. 4Aluminum Alloy: The aluminum alloy shell of the positioner has excellent corrosion resistance and rust resistance, which can better ensure the safety of the internal components and make it have a longer service life. 5Easy to Carry: This tester is small in size, light in weight, energy saving and stable output power. It is a good tool for optical fiber testing.