Welcome to our store! 1[Stable Red Light] The NF-904 series red light source uses a 650nm semiconductor laser as the light-emitting unit, powered by a constant power source, emitting stable red light and entering multimode and single-mode fiber after connecting to the optical interface to realize fiber fault detection function. 2[Strong Penetrating Power] The light source has strong penetrating power, the high-quality laser head can easily pass through the optical fiber, with long transmission distance and stable performance. 3[High-Quality Chip] The built-in high-quality chip is durable and suitable for a variety of interfaces to fully meet the needs of optical fiber inspection. 4[Durable Material] The optical cable fault detector is made of high-quality aluminum alloy, which is durable, safe, wear-resistant, and can be used with confidence for a long time. 5[Application] This optical cable fault detector is often used in many situations and is a practical tool for optical fiber construction, maintenance, production, and research, etc. Product Type: Optical Fiber Inspection Material: Aluminum Alloy Battery: 2 x AA 1.5V (battery not included) Application: Optical Fiber Line Inspection Language Version: English Compatible Interface: FT, ST, SC Light Source Wavelength: 65010nm Compatible Fiber: SM, MM Connection: Approx. 2.5 mm / 0.1 in universal adapter Red Light Source: Semiconductor Laser Operating Temperature: -10~+45 Storage Temperature: -15~+50 Packaging Includes: 1x Detector (battery not included) 1x Storage Case 1x Manual