Hicloud H420 series optical network tester is the firstmulti-functional intelligent andhigh-precision test instrument of Android system style.It uses "Android"UI design,adopts4.3-inch capacitive touchscreen,supports multi-point touch,and is more comfortable andsimple to operate It has 12 functional modules:AUTO OTDR,Expert OTDR,event map,opticalpower meter,visualfault location,stable laser source,RJ45 cable tracker,RJ45 cable sequence,RJ45cable length test,optical losstest,flashlight.It can meet various test require-ments in different occasions.OTDR has Im ultra short event blind area,the maximum dynamicrange is 32dB,8G of storage which can store 200000 curves;it uses 4000mAh high-density andhigh-capacity polymer lithium battery,and operating time is more than 10 hours under highbrightness.It has accurate testprecision and information collection ability,and the powerfulinternal analysis software can provide accurate data service for terminal testers.Hicloud H420series are used to measure the fiber and cable length,loss,connection qualityand other parameters.They are widely used in the construction of Metropolitan area networkcommunication system,line maintenance and emergency repair test,research and productionmeasurement of optical fiber and cable.