Optical Fiber Cable Pen, Stable Durable Optical Cable Fault Locator Optical Cable Wear for Construction for Net Maintenance NF-904-05 5mW,NF-904-10 10mW,NF-904-20

[Stable Red Light] NF-904 series red light source uses a 650nm semiconductor 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