Fangrui Product Details [4 In 1 Metal Clamp] Universal Metal Construction Clamps Are Available For 250m Bare Fiber; 900m Tight Sleeve Fiber And 2mm/3mm Fiber Optic Patchcords,eliminating The Need For Frequent Clamp Changes. [effective Recognition] Support 800-1700nm Wavelength Detection, Can Detect The Optical Signal In The Fixed Load Tone Signal: 270hz, 1khz And 2khz. [build In Opm+vfl Function]opm Function Can Support Detection Of 850/1300/1310/1490/1550/1625nm Wavelength, Test Range -70~+10dbm And -50~+26dbm.vfl Function Can Detect Distance Of 10-15km, Built-in 10mw Vfl Red Light Source. Macrobending Non-destructive Testing]it Can Be Tested Online To Identify The Power Direction, And Contains Frequency Detection Function, Without Interrupting The Business Under The Working Condition. Signal Frequency Detection Range Is +13~-30dbm, Signal Direction Detection Range Is +13~-50dbm. [ergonomic Design]directly The Test, The Test Is Convenient And Quick. Small Size And Light Weight, More Portable. Built-in 3.5-inch Led High-defi