The Fiberlink 6654 Dual Wavelength Single Mode Light Source is a cost effective, compact, handheld light source. The temperature compensated outputs are calibrated to couple -10dBm of optical power into single mode fiber. The light source comes installed with 1310nm & 1550nm FP Laser sources. The source has an intuitive two-button interface - one button for turning the unit ON or OFF and the other for wavelength selection. LED indicators highlight the selected source and verify that battery power is sufficient to maintain the calibrated output power. Fiberlink Dual Wavelength Single Mode Light Source series fiber optic light sources offer exceptional value at an economical price. These LED-based sources provide the fiber optic installer with a stable output when testing single mode fiber optic runs. The Fiberlink Dual Wavelength Single Mode Light Source offers the fiber optic professional with a simple, yet affordable, option for testing multimode fiber links at 1310nm and 1550nm.