[4 in 1 Metal Clamp] Universal metal construction clamps are available for 250m bare fiber 900m tight sleeve fiber and 2mm or 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 OPMandVFL Function]OPM function can support detection of 850 or 1300 or 1310 or 1490 or 1550 or 1625nm wavelength, test range -70-and10dBm and -50-and26dBm.VFL function can detect distance of 10-15km, built-in 10mw VFL red . 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 and13- 30dBm, signal direction detection range is and13- 50dBm. [Ergonomic Design]Directly press the test, the test is convenient and quick. Small size and light weight, more portable. Built-in 3.5-inch LED high-definition screen, clear observation of test results. Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! 2 AA batteries not included Colour:Photo Color Material:plastic Package Contents: 1 x Optical Fiber Identifier set 1 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.