Feature: 1. 10 Wavelength and Adapter: Our fiber optic power meter VFL has 10 wavelength, 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650 nm and with SC FC ST adapter for use. 2. 10mins Automatic Power Off: 50 KM VFL optic power net cable wire tester has 10 mins automatic power off function and fast and accurate. 3. 650mah Battery: VFL net cable tester power meter adopts sensitive chip and rugged internal structure. Low battery consumption and longer working time. Capacity 650mah internal 3.7V Li ion battery. 4. Plug and Play: There is no need to wait for warming up, optic power net cable tester VFL can do plug and play with accurate measurement, relative power calculation, calibration function. 5. Communicating Maintenance Using: Fiber optic power meter 50km VFL will be covering most of the requirements of communicating engineering maintenance. Specification: 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(Shipped With Battery) 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℃ Auto Shutdown Time: 10 Minutes Battery Duration: Not Less Than 40 Hours. Package List: 1 x Optical Power Meter1 x Instruction Manual 1 x USB Cable 1 x Lanyard