The SSF-TKITP-400 Optical Power Meter and Light Source units test both multimode and single mode fibers at four wavelengths with a range of 70dB to measure optical power loss on installed fiber. The included PC software allows fast testing and easy reporting. The kit includes adapters to test SC, LC, and FC terminated cables. Both Pro test units, along with included cables and adapters are contained in a rugged case that keeps the items within neat, organized, and protected.