This Jonard Tools FPL-5555 Fiber Power Meter with Data Storage and SM/MM Optical Light Source Kit provides everything you need to measure power and provide a stable light source for fiber optic cable testing. The FPM-55 Fiber Optic Power Meter can measure wavelengths from 800-1650 nm, with a mere 0.01 dB resolution. The FLS-55 Fiber Optic Light Source for providing a stable light source at 850/1300 nm for multimode or 1310/1550 nm wavelengths singlemode fiber measurements. The included H-22 rugged carrying case features carry straps.