Light Sources Stable sources for use in point-to-point attenuation measurements Fast and easy to use, the Light Sources provide a stable source for use in point-to-point attenuation measurements. The lightweight and rugged design is built for demanding cable installation environments. The light sources are offered in a variety of wavelengths to meet test applications from multimode LAN to singlemode telephony. Benefits Stable output for accurate loss readings Auto wavelength switching provides fast and accurate results Rugged design withstands years of use in the most challenging environments Fast and error free test results