10 WAVELENGTH & VFL: This fiber optic power meter features VFL and 10 wavelengths (850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650 nm) and includes SC FC ST adapters for versatile use. AUTO SHUT-OFF: Our VFL optical power network cable tester has a 10-minute auto shut-off function for energy saving, and provides fast and accurate testing. ACCURATE MEASUREMENT: No warm-up time needed! This VFL optical power network cable tester offers plug-and-play functionality with precise measurement, relative power calculation, and calibration capabilities. 40 HOURS OF WORKING TIME: The VFL optical power meter utilizes a sensitive chip and robust internal structure, ensuring low power consumption and extended working time. Enjoy up to 40 hours of continuous operation. ABS MATERIAL: Crafted from excellent ABS material, this fiber optic power meter and VFL cover most communication technology maintenance requirements. Item Type: Fiber Optic Power Meter Material: ABS Red Light VFL Detection Distance: 20km Power Supply: Requires 2 x AAA batteries (not included) Probe Range: InGaAs Wavelength Range: 850-1650nm Standard Wavelength: 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650nm Display Resolution Linearity Display: 0.1% Logarithmic Display: 0.01dBm Operating Temperature: -10 - +60℃ Storage Temperature: -25 - +70℃ Automatic Shut-off Time: 10 minutes Battery Life: Not less than 40 hours Includes: 1 x Optical Power Meter 1 x Lanyard 1 x User Manual