1VISUAL FAULT LOCATOR: This pen style tester is carefully designed for maintaining and optimizing optical cables, with an output distance of up to 10KM. 2FAULT LOCATION: This red light test pen allows for fast and accurate location of defects, with powerful visual search capabilities to identify fiber breaks with ease. 3NON CONTACT CONNECTION: The non contact connection technology ensures that your fiber and transmitter end face remain unscathed, delivering results without causing any damage. 4STABLE POWER OUTPUT: With a reliable and stable power output, this tester is equipped to resist the effects of voltage fluctuation, providing consistently accurate performance every time. 5COMPACT CONSTRUCTION: Made from lightweight and sturdy aluminum alloy, this visual fault locator is perfect for everyday use, with a small and portable design that ensures you can take it with you anywhere.