Feature: 1. 9 Functions: Our OTDR tester has 9 functions, OTDR, event reflection, optical power meter, visual fault locator, stable light source, Ethernet cable distance, Ethernet cable tracking, rj45 Ethernet cable sequence, LED light. 2. Operation Process: Fiber optic tester optical time domain reflectometer is used to evaluate FTTx and access net construction and maintenance, and identify fiber breakpoints. 3. 3.5inch Display: The optical time domain reflectometer has a 3.5inch color display, non touch, which allows you to observe the parameters more intuitively and test at 1310 or 1550nm. 4. Calculating Relative Optical Power Loss: Fiber optic tester can also measure the length of fiber optic cable and calculate the relative optical power loss. 5. Data Interface: The optical time domain reflectometer has a micro USB data interface, external memory card (not included), and includes analysis software for further data analysis or processing. Specification: Item Type: OTDR Fiber Optic Tester Optical Time Domain Reflectometer Model: AUA900A Material: ABS Connector Type: APC Dual Wavelength: 1310 Or 1550nm Display: 3.5 Inch Display Power Supply: Built In 3.7V 4000mah Polymers Battery (Shipping With Built In Battery) Nine Functions: OTDR, Event Reflection, Optical Power Meter, Visual Fault Locator, Stable Light Source, Ethernet Cable Distance, Ethernet Cable Tracking, Rj45 Ethernet Cable Sequence, LED Light. Package List: 1 x Optical Time Domain Reflectometer1 x Adapter1 x Charging Cable1 x Plug1 x Disc1 x Manual1 x Storage Bag1 x Storage Bag Strap1 x FC to LC Adapter