The Multi-function OTDR is used in the construction and maintenance of FTTx and access networks to evaluate fiber breakpoints, lengths, losses, and input light automatically. The tester is small and portable, with a 3.5-inch colorful LCD screen, a novel plastic shell design, and is shock and drop resistant. Fiber Optic OTDR, Event maps, stable light source, optical power meter, visual fault locator, cable sequence proofreading, cable length measurement, and illumination functions are all included in the tester. It has a universal connector, 600 internal storage, TF card, USB data storage, and a built-in 4000mAh lithium battery that can be charged by USB. It’s an excellent option for long-term field work.