... screen)PortUSB portPower supplyAC/DC (AC100 ~ 240V, 50/60Hz), DC: 8.4V, 0.5AEnvironmental requirementWorking environment temperature: 0~40°CStoring environment ... Test single mode Range(km)0.5, 1, 2, 4, 8, 16, 32, 64, 128Working width half-amplitude pulse(ns)10 ... 1.3-1.5Correction coefficient of optical fiberAdjust from 0.8-1.0The accuracy of testing length± (1m+sampling interval + test ...