1Energy Saving: This visual fault locator has good energy saving and stable output, and is a good tool for optical fiber testing and positioning. 2Non Contact Connection: This connection method does not damage the end face of the fiber and the transmitter, and the output power is not affected by voltage fluctuations. 3Compact and Portable: This pen type fiber optic tester is small and lightweight, and can be easily tucked in a bag or pocket for easy portability. 4Aluminum Alloy: The aluminum alloy shell of the positioner is corrosion resistant, rust proof, and resistant to falling and wear, providing a long service life for the positioner. 5Main Use: Visual fault detector is a device specially designed and maintained for optical cables and lines to locate defects on cables and cables, visually search for fiber breaks and use defective optical cables.