NK260 series OPM and VFL all-in-one machine are controlled by single chip microprocessor with complete functions. It can be well protected by using embedded detector and laser. It has 10 standard wavelengths, such as 1270nm/1577nm. It also has frequency identification, auto matic shutdown function, CW/1Hz/2Hz red light modes, wavelength memory, user calibration, and RJ45 network cable 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. It is widely used in optical cable construction and maintenance, optical fiber communication, optical cable sensing, -Optical CATV and other fields.