Features: 1. 10 WAVELENGTHS & VFL: This fiber optic power meter includes VFL and supports 10 wavelengths: 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650 nm, with SC, FC, ST adapters for versatile use. 2. AUTO SHUT-OFF TIME: Our network cable VFL optical power meter features a 10-minute auto shut-off function for quick and accurate testing. 3. ACCURATE MEASUREMENT: No warm-up time needed, this network cable VFL optical power meter can be used directly for precise measurements, relative power calculations, and has a calibration function. 4. 40 HOURS WORKING TIME: Utilizing a sensitive circuit and robust internal structure, the VFL optical power meter boasts low battery consumption and extended working hours, operating for up to 40 hours continuously. 5. ABS MATERIAL: Constructed from excellent ABS material, this fiber optic power meter with VFL covers most requirements for communication technology maintenance. Specification: Item Type: Fiber Optic Power Meter Material: ABS Red Light VFL Detection Distance: 20 km Power Source: Requires 2 x AAA batteries (batteries not included) Probe Range: InGaAs Wavelength Range: 850-1650 nm Standard Wavelengths: 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650 nm Display Resolution: Linear Display: 0.1% Logarithmic Display: 0.01 dBm Operating Temperature: -10 to +60 ℃ Storage Temperature: -25 to +70 ℃ Auto Shut-off Time: 10 minutes Battery Life: Not less than 40 hours. Package List: 1 x Optical Power Meter 1 x Lanyard 1 x User Manual