Hobbes FC-2009A Fiber Checker Pro II with Adapter is a ruggedly built and simple way to test for continuity, signal path and faults on fiber cabling. Hobbes FC-2009A is designed to test singlemode and multimode fiber, is drop resistant and waterproof to 1 meter, fits conveniently into any tool bag, and includes 2.5mm to 1.25mm adapter.