Three-wavelength light source/visual fault locator. 650nm, 1310nm and 1550nm, for single-mode measurement. JZ3106 offers more than 1mW 650nm light output through 650nm laser. 650nm red light is very useful in field applications, such as patchcord and pigtail inspection, fiber identifying for break-out or fan-out pigtails and so on. In addition, JZ3106A and JZ3106B provide two other wavelengths that are commonly used in single-mode or multi-mode fiber networks. JZ3106 could be used together with OPM3020 handheld power meters as a powerful test kits with wide dynamic attenuation range, stable output power and stable output wavelength.