OLS-200, a compact, handheld tester, provides stable laser light source in two different wavelengths for fiber cable testing. By providing the two most popular wavelengths, 1310nm and 1550nm, the OLS-200 is an ideal tester designed for optical fiber networks. When used in conjunction with any third party optical power meter or the OPM-500A from CTC Union, the actual optical attenuation of a fiber link can be determined during pre-installation of active devices or for troubleshooting in-field fiber problems.