The Cleerline Fiber Optic Testing and Troubleshooting Kit provides basic optical link testing and signal qualification for single-mode and multimode cables. The easy-to-use kit includes an optical power meter and two optical light sources, one for single mode fiber and one for multimode fiber, allowing technicians and installers to verify a wide range of signal wavelengths while calculating optical power loss in decibels (dB). In addition to the power meter and optical light sources, the kit also includes reference cables, couplers, adapters and cleaning pens packed in a durable plastic case. Used properly, the Fiber Optic Testing and Troubleshooting Kit is an essential tool for ensuring fiber cable and connector integrity, optical connection cleanliness and overall connection loss.