UT697: Optical Multimeter (Optical Power Meter + Light Source) The UT690 series is mainly used for continuous optical signal power measurement, optical device insertion loss testing, end-to-end optical fiber identification, etc. It is controlled by a low-power single-chip microprocessor, featuring a full range of functions. The body is made with advanced cold plastic molding technology, which is both aesthetically pleasing and durable. The design conforms to ergonomic requirements. The product adopts an internal detector, providing it with good protection. It has IP65 dust and water resistance, backlight display, automatic shutdown function, wavelength memory function, user self-calibration function, and a wide range of optical power testing capabilities. It is widely used in optical cable construction and maintenance, optical communication, optical sensing, optical CATV and other fields.