TR-104 series Optic Multimeter, hand-held optical Power meter and red-light integrated testers are mainly used for continuous optical signal power measurement, optical fiber link loss testing and optical fiber line on-off testing. 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 molding technology, which is beautiful and durable. The red-light integrator of the optical power meter can be well protected by using embedded detectors and lasers. The tester has compact shape, automatic shutdown function, backlight display, wavelength memory function, support user calibration, wide test range, and support lighting.