Hand-held optical power meter, red-light integrated machine series products are mainly used for continuous optical signal power measurement, optical fiber link loss testing and optical fiber line on-off testing. It is controlled by a single chip microprocessor with complete functions. Widely used in optical cable construction and maintenance, optical fiber communication, optical cable sensing, optical CATV and other fields. The fuselage design meets the requirements of human body function and adopts advanced thermoplastic moulding technology, which is beautiful and durable. The red-light integrator of optical power meter can be well protected by using embedded detectors and lasers. The tester has compact shape, automatic shutdown function, three red light modes, backlight display, wavelength memory function, optical fiber work identification, support user calibration, wide test range, support lighting.