TLD7002 Handheld Laser source series is microprocessor-controlled intelligent Handheld Laser source. It can be used to test the usual single-mode optical fiber connector loss.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, which are the best performance at home and the most practical appearance of the light source. With the current international advanced level, handheld light source provides continuous or modulated light output (2 KHz) in the state of the two working conditions.