GLK270 OPM/OPM&VFL series products use single chip microprocessor control,Complete Functions 。 adopt embedded detector and laser,which can be well protect- ed.The machine has 10 standard wavelengths such as 1270nm/1577nm,and also has frequency recognition, wavelength recognition,automatic shutdown,CW/1Hz/2Hz three red light modes,backlight display,wavelength memory,user calibration,lighting and other func- tions.while supporting Support RJ45 cable sequence and line hunting test,wide test range,high accuracy. GLK270 mainly used for continuous optical signal power measurement,optical fiber link loss test and optical fiber line on-off test.They are widely used in optical cable construction and maintenance,optical fiber communica- tion,optical cable sensing,optical CATVand other fields.