Feature: 1. 5 in 1 Design: Can be used as optical time domain reflectometer, optical power meter, stable light source, red light fault location and LED light. 2. Simple Operation: Equipped with 3.5in display touchscreen, the optical time domain reflectometer OTDR is very simple to operation for testing and measurement. 3. Smart Testing: Used to evaluate FTTx and access network construction and maintenance, identify fiber optic break points, measure fiber optic cable length, and calculate relative optical power loss. 4. Wide in Range: OTDR optical time domain reflectometer can measure a wide range of fiber optic networks, including long distance fiber optic networks and distributed fiber optic sensing networks. 5. Easy Carrying: Comes with a compact size and a light weight as well, the OTDR is very convenient to carry for both indoor and outdoor use. Specification: Item Type: Optical Time Domain Reflectometer Model: AUA-18U Port: UPC Material: ABS Stable Light Source Connector: SC PC Optical Power Meter Connector: SC FC ST Stable Light Source: 1550nm OTDR: 0-60km Optical Power Meter: 7 wavelengths of 850, 1300, 1310, 1490, 1550, 1625 and 1650. Lighting: LED Light Dust Proof Interface: SC interface for OTDR, 2.5mm interface for OPM PFL. Display: 3.5in touchscreen display. Power Supply: Built in 3.7V 2200mah polymer lithium battery. Five Functions: Optical time domain reflectometer, optical power meter, stable light source, red light fault location, LED light. . Package List: 1 x Optical Time Domain Reflectometer1 x User Manual1 x Plug1 x USB Cable1 x Disc1 x Storage Box