Welcome to the store! 1、10 Wavelengths and Adapters: Our fiber optic power meter VFL has 10 wavelengths: 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650 nm, and includes SC FC ST adapters for versatile use. 2、10mins Auto Shutdown: The 50 KM VFL optical power network cable tester features a 10-minute automatic shutdown function for energy saving and provides fast, accurate readings. 3、650mah Battery: The VFL network cable tester power meter uses a sensitive chip and robust internal structure. It boasts low battery consumption and longer working time, powered by a 650mAh internal 3.7V Li-ion battery. 4、Plug and Play: No need to wait for warm-up! The optical power network cable tester VFL offers plug-and-play functionality with precise measurement, relative power calculation, and a calibration function. 5、Communication Maintenance Use: This fiber optic power meter 50km VFL covers most communication technical maintenance requirements. Item Type: Fiber Optic Power Meter Material: ABS Red Light VFL Detection Distance: 50km Power Supply: Internal 3.7V Li-ion Battery x 1, Capacity 650mah (Supplied With Battery) Probe Range: InGaAs Wavelength Range: 850-1650nm Standard Wavelength: 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650nm Display Resolution Linear Display: 0.1% Logarithmic Display: 0.01dBm Operating Temperature: -10 - +60℃ Storage Temperature: -25 - +70℃ Automatic Shutdown Time: 10 Minutes Battery Life: Not Less Than 40 Hours Includes: 1 x Optical Power Meter 1 x User Manual 1 x USB Cable 1 x Lanyard Your satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!