Features FREQUENCY IDENTIFICATION: The optical fiber identifier can recognize three signal frequencies (270Hz, 1KHz, 2KHz), and there is beep sound for reminding. DIRECTION INDICATION: When there is a signal from the optical fiber, the left and right direction lights display the signal direction. 10LM VFL: The fiber detector has built in red light source, with stable luminescence and strong light source, fiber penetration testing distance is up to 10KM. MULTI FUNCTION: The fiber identifier also has the functions of optical power meter and RJ45 network test, making it highly practical. UNIVERSAL CLAMP: The optical fiber detector features 4 in 1 universal clamp, and is suitable for 0.25 0.9 2.0 3.0mm fibers. Specification: Item Type: Optical Fiber Identifier Material: ABS Model: AUA 507 Battery: 9V 6F22 battery x 1 (shipped without battery) Use: Fiber optic identification Basic Parameter: Wavelength Range: 800-1700nm Signal Recognition Type: CW, 270Hz±5%, 1kHz±5%, 2kHz±5% Detector Type: Dia1mm InGaAs 2 pcs Adapted Fiber Type: Universal Dia0.25, Dia0.9 (for bare fibers), Dia2.0, Dia3.0 (for tail fiber) Signal Direction: LED indicator light for left and right direction indication Optical Power Reading Range: -70dBm to +10dBm Display Resolution: Linear display: 0.1%, logarithmic display: 0.01dBm Wavelength Range: 850-1650nm Red Light Source Usage Distance: >10km Working Temperature: -10℃ to +60℃ Storage Temperature: -25℃ to +70℃ Package List:1 x Optical Fiber Identifier1 x User Manual1 x Storage Box Package List 1 x Optical Fiber Identifier 1 x User Manual 1 x Storage Box