NK270 OPM/OPM&VFL series products use single chip microprocessor control,Complete Functions.adopt embedded detector and laser,which can be well protected.The machine has 10standard wavelengths such as 1270nm/1577nm,and also has frequency recognition,wavelength recognition,automatic shutdown,CW/IHz/2Hz three red light modes,backlight display,wavelength memory,user caibration,lighting and other functions.while supporting Support RJ45 cable sequence and line hunting test,widetest range,highaccuracy. NK270mainly usedfor continuous optical signal power measurement,optical fiber link loss test and optical fiber line on-off test.They are widely used in optical cable constructon and maintenance,optical fiber communica- tion,optical cable sensing,optical CATV and other fields.