Fiber Power Meter & Optical Light Source Kit (-50 to +26 dBm, Single Mode) | FPL-5050Description Fiber Power Meter & Optical Light Source Kit ( 50 to +26 dBm, Single. Mode) This tool kit provides everything you need to measure power and provide a stable light source for fiber optic cable testing. Features Features The FPM 50A Fiber Optic Power Meter to measure wavelengths from 800 1650 nm, with a mere 0. 01 dB resolution Measures 6 preset calibrated wavelengths with high precision to determine absolute or relative power Includes FC SC