1[Stable Red Light] NF904 series red light source uses a 650nm semiconductor laser as a light emitting device, driven by a constant source, emits stable red light, and enters multi mode and single mode fiber after connecting with 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, the transmission distance is long, and the performance is stable. 3[High Quality Chip] The built in high quality chip is durable, and it is suitable for a variety of interfaces to fully meet the needs of optical fiber inspection work. 4[Durable Material] The optical cable fault locator is made of high quality aluminum alloy, which is durable, safe, wear resistant, and can be used with confidence for a long time. 5[Widely Application] This optical cable fault locator is widely used in many situations, and is a practical tool for optical fiber engineering construction, optical fiber net maintenance, optical device production and research, etc. Item Type: Optical Cable Fault Locator Material: Aluminum alloy Battery: 2 x AA 1.5V (Battery Not Included) Application: Optical fiber line inspection Language Version: English Applicable Interface: FT, ST, SC Light Source Wavelength: 65010nm Applicable Fiber: SM, MM Connector: Approx. 2.5mm / 0.1in universal adapter Red Light Source: Semiconductor laser Working Temperature: -10~+45 Storage Temperature: -15~+50 1 x Detector (Battery Not Included) 1 x Storage Bag 1 x Manual 1. Do not irradiate the eyes, otherwise it may cause damage to the eyes2. Keep the interface clean. After use, please close the cap of the dustproof pen tightly3. If you don't use it for a long time, please take out the battery to prevent the battery from rot and leakage and damage the red light pen