3.5in LCD Screen Fiber Tester 1310/1550nm Optical Time Domain Reflectometer
(F1: Switch wavelength, F2: Set reference power, F3: Set reference power to zero, F4: Enter oscilloscope mode). Attenuation Dead Zone: 15m. Event Dead Zone: 10m. Test Range:10m~60km. The sale of this item may be subject to regulation by the U.S. Food and Drug Administration and state and local regulatory agencies.