The Tempo T27600 Series Optical Loss Test Sets give fiber technicians a compact, field-ready way to test optical power, insertion loss, continuity, and faults across multimode and singlemode fiber networks. With options for multimode, singlemode, or combined MM/SM testing, these OLTS units support common test wavelengths and include VisiTester functionality to help visually identify fibers during loss testing. Designed for flexibility, productivity, and straightforward field use, the T27600 Series helps technicians verify fiber performance without turning every test into a science project.