NK4200 Mini OTDR with live test is compact and easy to carry;4.3-inch high-definition touch screen,supports OTDR,event map,split-wave OPM,red light,light source,flashlight,RJ45 sequence and other functions in one,to meetdifferent occasions a variety oftest needs.The OTDR function is standard with single wavelength and built-in efficient wavelength isolator,which can carry out optical test on the link,with the minimum event blind area of 1.5m and the maximum measurement range of 100km. NK4200 is usedto measure the length,loss,connection qualityand other parameters of the optical fiber.It can easily test the breakpoint,bend,and loss point of the optical fiber link.It is suitable for line maintenance and emergency repair testing by installation and maintenance personnel.