The Fluke Fiber Optic Meter (FOM) measures optical power on fiber optic cables. It indicates power loss on tested cables using any digital multimeter (DMM) or graphical multimeter that has a 10 Me input impedance, standard diameter banana jacks, and mVdc capability. The FOM helps you test and maintain fiber optic cable without having to buy a whole new meter. Quickly and accurately verify fiber optic cable system loss. Light sources and patch cords sold separately.