Optical time domain reflectometer - Line maintenance, One machine can do it. Multiple functions - Fully functional, to meet the needs of the work. Support active fiber test - Advanced wavelength isolation technology, Realize the measurement function with light. Even support active fiber test,The optical device will not be damaged, Closely protect their own precision parts. Compact and portable - Support multi touch,smooth control,Dazzle soft light screen, adjustable screen brightness. Convenient charging - 2200mAh Large-capacity lithium battery with worry-free battery life. Dustproof interface - OTDR:Applicable to SC interface; OPM/VFL Suitable for 2.5mm interface OTDR: 0-80km OPM: 8 wavelengths OLS: 1550nm VFL: 10mw LED lighting 3.5 inch HD touch screen 2200mAh large capacity Specification:AUA-18U/AUA-18A Colour:Green Material:Plastic<br><br>Package Contents: 1 * Optical Fiber Inst ent Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.