Features MULTIPLE USAGES: Used for measuring the continuous optical signal power, testing the connection and disconnection of fiber optic cable, troubleshooting optic line faults, testing fiber optic line losses. APPLICABLE RANGE: Supports standard wavelength switching at 850nm, 980nm, 1300nm, 1310nm, 1490nm, 1550nm, 1625nm, suitable for 800‑1700nm optical fiber, compatible with SC FC ST connector. PRODUCT FUNCTIONS: This fiber power meter has backlight switch button and flashlight, 120s auto power off, wavelength memory and user calibration, displays linear mW and nonlinear dBm at the same time. EXCELLENT PARTS: The fiber optic tester adopts low power consumption single chip microprocessor for control, with complete functions and stable performance, the built in probe improves its service life. APPLICABLE FIELDS: This handheld optical power meter is widely used in fields such as fiber optic cable construction and maintenance, fiber optic comm, fiber optic sensing, and optical CATV. Specification: Item Type: Optical Power Meter Power Supply: 3 x AAA Alkaline Dry Battery (Not Included) Power Measurement Range: -50 to +26dBm Probe: InGaAs Wavelength Range: 800-1700nm Standard Wavelength: 850nm, 980nm, 1300nm, 1310nm, 1490nm, 1550nm, 1625nm Display Resolution: Linear Display: 0.1%, Logarithmic Display: 0.01dBm Operating Temperature: -10-60℃ Storage Temperature: -30-70℃ Auto Power Off Time: 120s LCD Display: The measured power values are displayed in dB, dBm, mW, uW, and nW forms; 8 display wavelengths. Package List:1 x Optical Power Meter 1 x User Manual Package List 1 x Optical Power Meter 1 x User Manual