Brand New TLD7002 Hand Held Optical Laser Light Source Dual Wavelength 1310/1550nm 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.