NK260 series OPM and VFL all-in-one machine arecontrolled by single chip microprocessor with completefunctions. It can be well protected by using embeddeddetector and laser. It has 10 standard wavelengths, such as1270nm/1577nm. It also has frequency identification, auto-matic shutdown function, CW/1Hz/2Hz red light modes,wavelength memory, user calibration, and RJ45 networkcable sequence and tracking test function.NK260 series is mainly used for continuous optical signal,continuous modulation optical signal power measurement,optical fiber link loss test and optical fiber line on-off test. Itis widely used in optical cable construction and mainte-nance, optical fiber communication, optical cable sensing,Optical CATV and other fields.