4-in-1 Mini Optical Fiber Tester Pen — High-Precision Red-Light Visual Fault Locator & Optical Power Meter, 5km/15km Range, Accurate Identification

Compact 4-in-1 tester that combines an Optical Power Meter, Visual Fault Locator and Network Cable Test in a mini red optical fiber pen. It offers DIY self-calibration so you can adjust test parameters to match on-site requirements. A built-in bright LED flashlight aids inspections in dark environments. The unit uses an imported head for longer penetration distance and extended service life. Supports three connector types: FC, SC and ST. Red-light locating provides effective detection ranges of 5km/15km for accurate identification.