[4 in 1 Metal Clamp] Universal metal construction clamps are available for 250μm bare fiber; 900μm 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-definition screen, clear observation of various 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.