3.5 Inch Touching Display Screen Fiber Tester 5 In 1 AUA 18A Optical Time Domain Reflectometer US Plug 100‑240V Item Type: Optical Time Domain Reflectometer Model: AUA 18A Port: APC Material: ABS Stable Light Source Connector: SC, PC Optical Power Meter Connector: SC, FC, ST Stabilized Light Source: 1550nm Optical Time Domain Reflectometer: 0-60km Optical Power Meter: 7 Types of Wavelength 850, 1300, 1310, 1490, 1550, 1625, 1650 LED Illumination Dustproof Interface: SC Interface for Optical Time Domain Reflectometer, 2.5mm Interface for OPM And PFL Display: 3.5inch Touch Screen Display Power Supply: Built In 3.7V 2200mah Lithium Polymer Battery ( Shipped With Built In Battery ) Five Functions: Optical Time Domain Reflectometer, Optical Power Meter, Stable Light Source, Red Light Fault Location, LED Light