NK5520 OTDR adopts a 5.6-inch color capacitive full touch screenwhich supports dual operation of button +touch.The appearance isnovel and beautiful,strongand duable;Simple interface,easy to operate,can quickly and efficientlycarry out fieldtesting and maintenanceoperations;Internal integration OTDR,event map,optical power meterRJ45line sequencehunt and otherfunctions to meet different occasionsa variety oftest needs.The whole machineis matched with powerfuinternal analysis software,which can provide accurate data services forterminal testers.NK5520 series is used to measure the length,loss,connection qualityand other parameters of various optical fiber and cable.It is widely usedinthe engineering construction,lnemaintenanceandemergency repailtest of optical fiber to the home,metropolitan area and secondary backbone network communication systems,and the development angproduction measurement of optical fiber cables.