Brand New TLD7002P Hand Held Optical Laser Light Source Dual Wavelength 1490/1310/1550nm a single-mode fiber-optic network, LAN, FDDI, ATM , FTTH fiber optic systems, It also can test the telecommunications networks, CATV systems which need large dynamic range test system maintenance. The handheld stable source with the international advanced level in the micro-processing hardware ,software technology , microelectronic technology, and surface mount (SMT) technology provides its users with high performance, high reliability.