Features DIRECTION RECOGNITION: Using micro bend testing technology to accurately identify the direction of the fiber, when there is a signal, the left and right direction light display the signal direction. STABLE LIGHT SOURCE: With red light source and LED light, stable and powerful, with concentrated beam, combined with circuit detection, no need to interrupt the light source during online testing. APPLICABLE RANGE: The recognition wavelength range is 800nm‑1700nm, the signal power detection range is ‑40‑10 dBm, suitable for 0.25mm bare fibers, 0.9mm, 2.0mm, and 3.0mm tail fibers. WITH LIGHT HOOD: The fiber optic signal identifier is equipped with light shield, providing accurate and stable measuring results, greatly improving measurement efficiency. PORTABLE DESIGN: The optical fiber signal identifier is portable design, simple and convenient operation, can identify 270Hz, 1kHz, 2kHz signal frequency, strong practicability. Specification: Item Type: Optical Fiber Identifier Identification Wavelength Range: 800nm-1700nm Probe Type: For InGaAs Adapter Type: 0.25mm (bare fiber), 0.9, 2.0, 3.0mm (tail fiber) Signal Power Detection Range: -40-10dBm Modulation Frequency: CW/270Hz, 1kHz, 2kHz Signal Frequency Indication: 270Hz, 1kHz, 2kHz Frequency Detection Range (Average):  0.9mm Tail Fiber: -30-0dBm (270Hz) 2.0mm 3.0mm Tail Fiber: -25-0dBm (270Hz, 1kHz, 2kHz) 0.25mm Bare Fiber: -20-0dBm (2KHz) Insertion Loss (Typical Value): 0.8dB (1310nm): 2.5dB (1550nm) Storage Temperature: -10-70℃ Working Temperature: 0-50℃ Signal Direction Indication: LED indicator light, left and right direction Battery: 1 x 9V Alkaline Battery (not included) Package List: 1 x Optical Fiber Identifier 1 x Storage Bag 3 x Accessories Package List 1 x Optical Fiber Identifier 1 x Storage Bag 3 x Accessories