Model 3023 is a fiber optic power meter manufactured by GAO Fiber Optics Inc. to measure absolute optical power and relative fiber loss. The testing instrument is suitable for use in the installation of single-mode optical cable networks and for debugging and maintenance of telecommunications networks, CATV networks and local ones. Compact and lightweight, it has a large-character LCD screen and consumes little power. It operates from 780 to 1700 nm, with input value ranging from –43 to 27 dBm. It can operate continuously for up to 20 h.